Answer:
The cost of a 12 minute call to France is $ 3.63
Step-by-step explanation:
given:
The cost of 15 minute call to France = $ 4.29
The cost of 10 minute call to France = $ 3.19
To Find :
The cost of a 12 minute call to France = ?
Solution:
Let the flat fee be X
and the cost per minute be Y
so the 15 minute call to France will be
X + 15(Y) = 4.29---------------------------(1)
the 10 minute call to France will be
X + 10(X) = 3.19----------------------------(2)
Subtracting (2) from (1)
X + 15(Y) = 4.29
X + 10(Y) = 3.19
- - -
---------------------------------
5Y = 1.10
--------------------------------
[tex]Y =\frac{1.10}{5}[/tex]
Y = 0.22
So the cost per minute of a call = $0.22
substituting the values in (1)
X + 15(0.22) = 4.29
X + 3.3 = 4.29
X = 4.29 -3.3
X = 0.99
Now the cost of 12 minute call is
=>X + 12(Y)
=> 0.99 + 12(0.22)
=> 0.99 + 2.64
=> 3.63
You want to paddle a canoe across a small lake and want to know how far it is to the other side. You take measurements ln your side of the lake and make the drawing shown . What is the distance x across the lake
Answer:
[tex] x= 5*400 ft = 2000 ft[/tex]
Step-by-step explanation:
For this case we can use the figure attached and we are interested in order to find the value of x.
We have two similar triangles (DEC and ABC) and we can find the scale factor like this:
[tex]Factor= \frac{EC}{BC}=\frac{500ft}{100ft}=5[/tex]
And now we can apply proportions in order to find the value of x using the two sides DE and BA, since we have the ratio between the triangle DEC and ABC we have this:
[tex]Factor=5=\frac{x ft}{400 ft}[/tex]
And solving for x we got:
[tex] x= 5*400 ft = 2000 ft[/tex]
And then the distance across the lake would be 2000 ft
Answer:
ewq
Step-by-step explanation:
What point located in quadrant I has an x-value that is 2 units from the origin and a y-value 7 units from the origin?
Final answer:
The point in Quadrant I with an x-value 2 units from the origin and a y-value 7 units from the origin has coordinates (2, 7).
Explanation:
The student is asked to determine the coordinates of a point that lies in Quadrant I of the Cartesian coordinate system, with an x-value that is 2 units from the origin and a y-value 7 units from the origin.
The Cartesian coordinate system is divided into four quadrants, and Quadrant I is where both x and y values are positive.
Therefore, a point located 2 units away from the origin on the x-axis, and 7 units away on the y-axis, would have coordinates (2, 7).
Remember, the origin is the point where the x-axis and y-axis intersect, (0,0). Moving 2 units to the right, you reach an x-value of 2. Then, moving up 7 units, you achieve a y-value of 7.
Thus, the coordinates are (2, 7).
Zachary and his children went into a bakery and he bought $15 worth of cupcakes and brownies. Each cupcake costs $3 and each brownie costs $1.50. He bought 3 times as many brownies as cupcakes. Determine the number of cupcakes and the number of brownies that Zachary bought.
Step-by-step explanation:
the answer is
Y=2.5
X=3.75
Answer:
6 brownies and 2 cupcakes.
Step-by-step explanation:
Let the number of brownies be b and the number of cupckes be c.
We have the following system:
b = 3c
1.5b + 3c = 15
Substituting for b in the second equation:
4.5c + 3c = 15
7.5c = 15
c = 2.
Thus b = 3c = 6.
Given points A (1, 2/3), B (x, -4/5), and C (-1/2, 4) determine the value of x such that all three points are collinear
Answer:
[tex]x=\frac{83}{50}[/tex]
Step-by-step explanation:
we know that
If the three points are collinear
then
[tex]m_A_B=m_A_C[/tex]
we have
A (1, 2/3), B (x, -4/5), and C (-1/2, 4)
The formula to calculate the slope between two points is equal to
[tex]m=\frac{y2-y1}{x2-x1}[/tex]
step 1
Find the slope AB
we have
[tex]A(1,\frac{2}{3}),B(x,-\frac{4}{5})[/tex]
substitute in the formula
[tex]m_A_B=\frac{-\frac{4}{5}-\frac{2}{3}}{x-1}[/tex]
[tex]m_A_B=\frac{\frac{-12-10}{15}}{x-1}[/tex]
[tex]m_A_B=-\frac{22}{15(x-1)}[/tex]
step 2
Find the slope AC
we have
[tex]A(1,\frac{2}{3}),C(-\frac{1}{2},4)[/tex]
substitute in the formula
[tex]m_A_C=\frac{4-\frac{2}{3}}{-\frac{1}{2}-1}[/tex]
[tex]m_A_C=\frac{\frac{10}{3}}{-\frac{3}{2}}[/tex]
[tex]m_A_C=-\frac{20}{9}[/tex]
step 3
Equate the slopes
[tex]m_A_B=m_A_C[/tex]
[tex]-\frac{22}{15(x-1)}=-\frac{20}{9}[/tex]
solve for x
[tex]15(x-1)20=22(9)[/tex]
[tex]300x-300=198[/tex]
[tex]300x=198+300[/tex]
[tex]300x=498[/tex]
[tex]x=\frac{498}{300}[/tex]
simplify
[tex]x=\frac{83}{50}[/tex]
USA Today reports that about 25% of all prison parolees become repeat offenders. Alice is a social worker whose job is to counsel people on parole. Let us say success means a person does not become a repeat offender. Alice has been given a group of four parolees.(a) Find the probability P(r) of r successes ranging from 0 to 4. (Round your answers to three decimal places.)P(0) =P(1) =P(2) =P(3) =P(4) =(c) What is the expected number of parolees in Alice's group who will not be repeat offenders? (Round your answer to two decimal places.)What is the standard deviation? (Round your answer to two decimal places.)(d) How large a group should Alice counsel to be about 98% sure that three or more parolees will not become repeat offenders?
Answer:
a) [tex]P(X=0)=(4C0)(0.75)^0 (1-0.75)^{4-0}=0.0039[/tex]
[tex]P(X=1)=(4C1)(0.75)^1 (1-0.75)^{4-1}=0.0469[/tex]
[tex]P(X=2)=(4C2)(0.75)^2 (1-0.75)^{4-2}=0.211[/tex]
[tex]P(X=3)=(4C3)(0.75)^2 (1-0.75)^{4-3}=0.422[/tex]
[tex]P(X=4)=(4C4)(0.75)^2 (1-0.75)^{4-4}=0.316[/tex]
b) [tex] E(X) = np = 4*0.75=3[/tex]
c) [tex] Sd(X) =\sqrt{np(1-p)}=\sqrt{4*0.75*(1-0.75)}=0.866[/tex]
d) [tex] P(X \geq 3) \geq 0.98[/tex]
And the dsitribution that satisfy this is [tex]X\sim Binom(n=9,p=0.75[/tex]
Step-by-step explanation:
Previous concepts
The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".
Let X the random variable of interest, on this case we now that:
[tex]X \sim Binom(n=4, p=1-0.25=0.75)[/tex]
The probability mass function for the Binomial distribution is given as:
[tex]P(X)=(nCx)(p)^x (1-p)^{n-x}[/tex]
Where (nCx) means combinatory and it's given by this formula:
[tex]nCx=\frac{n!}{(n-x)! x!}[/tex]
Part a
[tex]P(X=0)=(4C0)(0.75)^0 (1-0.75)^{4-0}=0.0039[/tex]
[tex]P(X=1)=(4C1)(0.75)^1 (1-0.75)^{4-1}=0.0469[/tex]
[tex]P(X=2)=(4C2)(0.75)^2 (1-0.75)^{4-2}=0.211[/tex]
[tex]P(X=3)=(4C3)(0.75)^2 (1-0.75)^{4-3}=0.422[/tex]
[tex]P(X=4)=(4C4)(0.75)^2 (1-0.75)^{4-4}=0.316[/tex]
Part b
The expected value is givn by:
[tex] E(X) = np = 4*0.75=3[/tex]
Part c
For the standard deviation we have this:
[tex]Sd(X) =\sqrt{np(1-p)}=\sqrt{4*0.75*(1-0.75)}=0.866[/tex]
Part d
For this case the sample size needs to be higher or equal to 9. Since we need a value such that:
[tex] P(X \geq 3) \geq 0.98[/tex]
And the dsitribution that satisfy this is [tex]X\sim Binom(n=9,p=0.75[/tex]
We can verify this using the following code:
"=1-BINOM.DIST(3,9,0.75,TRUE)" and we got 0.99 and the condition is satisfied.
To find the probabilities of different numbers of successes ranging from 0 to 4 in a group of parolees, we can use the binomial probability formula. The expected number of parolees who will not be repeat offenders can be calculated by multiplying the probability of success by the total number of parolees. The standard deviation can also be calculated using a formula. To be about 98% sure that three or more parolees will not become repeat offenders, Alice should counsel a group size of at least 13 parolees.
Explanation:To find the probabilities of different numbers of successes, we can use the binomial probability formula. Given that the probability of success is 0.25 and the number of trials is 4, we can calculate the probabilities as follows:
P(0) = (1-0.25)^4 = 0.316P(1) = 4C1 * 0.25^1 * (1-0.25)^3 = 0.421P(2) = 4C2 * 0.25^2 * (1-0.25)^2 = 0.281P(3) = 4C3 * 0.25^3 * (1-0.25)^1 = 0.047P(4) = 4C4 * 0.25^4 * (1-0.25)^0 = 0.008The expected number of parolees who will not be repeat offenders can be calculated by multiplying the probability of success (0.25) by the total number of parolees (4), which gives an expected value of 1 parolee. The standard deviation can be calculated using the formula sqrt(n * p * (1-p)), where n is the number of trials and p is the probability of success. In this case, the standard deviation is sqrt(4 * 0.25 * (1-0.25)) ≈ 0.866.
To determine the size of the group that Alice should counsel to be about 98% sure that three or more parolees will not become repeat offenders, we can use the binomial cumulative distribution function. We need to find the smallest value of n (the number of trials) such that P(X ≥ 3) > 0.98, where X represents the number of successes. Solving this inequality, we find that Alice should counsel a group size of at least 13 parolees.
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If x, y, and z are integers greater than 1, and (327)(510)(z) = (58)(914)(xy), then what is the value of x?
(1) y is prime
(2) x is prime
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
Both statements TOGETHER are sufficient, but NEITHER one ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
Answer:
Statements (1) and (2) TOGETHER are NOT sufficient.
Explanation:
As in the equation (327)(510)(z) = (58)(914)(xy) there are THREE variables in total i.e. "x", "y" and "z" hence minimum three equations are required to find out values of all variables. Hence,
If the given number of equations is equal to total variable used in any of the equation, values of all the variables can be find out otherwise there can be unlimited number of solutions.
So, value of "x" cannot be determined with the given data.
Nuri joins a game for a car. The rule is that Nuri picks one key from the box either A, B, or C. A box has two keys but only one can be used. B box has three keys but only one can be used. C box has two keys but none of them can be used.
What is the probability that Nuri can win the car?
Answer:0.277
Step-by-step explanation:
Given there are three boxes i.e. A , B and C
Probability of selecting any box is [tex]P_1=\frac{1}{3}[/tex]
Box A contains 2 keys out of which is 1 is correct so Probability of selecting the right key is [tex]P_2=\frac{1}{2}[/tex]
Box B contains 3 keys out of which is 1 is correct so Probability of selecting the right key is [tex]P_3=\frac{1}{3}[/tex]
Box C contains 2 keys out of which is 1 is correct but we cannot use it so Probability of selecting the right key is [tex]P_4=0[/tex]
Probability of selecting the right key is [tex]P=P_1\times P_2+P_1\times P_2+P_1\times P_3[/tex]
[tex]P=\frac{1}{3}\times \frac{1}{2}+\frac{1}{3}\times \frac{1}{3}+\frac{1}{3}\times 0[/tex]
[tex]P=\frac{5}{18}[/tex]
[tex]P=0.277[/tex]
A hardware store rent vacuum cleaners that customers for part or all of A day before returning. The Store charges a flat fee Plus an hourly rate. Write a linear function F for the total retail cost of a vacuum cleaner.
A linear function can be used to represent the total retail cost of renting a vacuum cleaner: F(x) = 31.50 + 32x.
Explanation:A linear function can be used to represent the total retail cost of renting a vacuum cleaner. Let's denote the fixed fee as $31.50 and the hourly rate as $32. The linear function F for the total retail cost of a vacuum cleaner can be written as:
F(x) = 31.50 + 32x
Where x represents the number of hours the vacuum cleaner is rented for and F(x) gives the total retail cost.
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The flat fee that the store charges is $14 and the cost for 7 hours is $56
A linear equation is on the form:
y = mx + b
where y, x are variables, m is the rate of change and b is the initial value of y.
let f for the total rental cost of a vacuum cleaner for x hours
Using the points (1, 20) and (3, 32) from the table:
f-f1=(f2-f1)/(x2-x1) (x-x1)
f-20=(32-20)/(3-1) (x-1)
f(x)=6x+14
The flat fee that the store charges is $14
The reasonable domain is 1 ≤ x ≤ 12
The cost for 7 hours is:
f(7) = 6(7) + 14 = 46
here is the complete question-
A hardware store rents vacuum cleaners that customers may use for part or all of a day before returning. The store charges a flat fee plus an hourly rate. Part A Write a linear function f for the totall rental cost of the vacuum cleaner. A. f(x)=6x+14 B. f(x)=3x+14 C, f(x)=3x+22 D. f(x)=6x+24 Part B What is a reasonable domain for the function? A. 14 B. 1 C. 0 D. 20
least to greatest
A-7.2*10^-4 B+8.1*10^-6 C=1.2*10^4 D=9.5*10^5
answers A)D
B) B
C)B
D) D
Step-by-step explanation:
9.5 × 10^(5) is greater than 1.2 × 10^(4) is greater than 8.1 × 10^(-6) is greater than -7.2×10^(-4)
D > C > B > A
To order the numbers from least to greatest, one must compare the exponents in scientific notation. The correct sequence from least to greatest is B, A, C, D.
The question asks to order the given numbers from least to greatest. The numbers are provided in scientific notation, which is a way of expressing numbers that are too big or too small to be conveniently written in decimal form. To compare these numbers, we look at their power of 10, as this indicates the number's scale or size.
'A' is 7.2*10^-4 which is a small positive number.
'B' is 8.1*10^-6 which is even smaller, given the more negative exponent.
'C' is 1.2*10^4 which is a large positive number.
'D' is 9.5*10^5 which is larger than 'C', given the larger exponent.
Therefore, when ordered from least to greatest, the sequence is: B, A, C, D.
An arithmetic sequence begins as follows: a1=13 a2=19 Which of the following gives the definition of its nth term?
Answer:
the nth term of the sequence is [tex]a_n=6n+7[/tex]
Step-by-step explanation:
Given : An arithmetic sequence begins as follows: [tex]a_1=13, a_2=19[/tex]
To find : Which of the following gives the definition of its nth term?
Solution :
The nth term of the A.P is [tex]a_n=a+(n-1)d[/tex]
The first term is [tex]a=a_1=13[/tex]
The common difference is [tex]d=a_2-a_1[/tex]
[tex]d=19-13=6[/tex]
Substitute in the formula,
[tex]a_n=13+(n-1)6[/tex]
[tex]a_n=13+6n-6[/tex]
[tex]a_n=6n+7[/tex]
Therefore, the nth term of the sequence is [tex]a_n=6n+7[/tex]
The nth term of the given arithmetic sequence is defined by the formula an = 13 + (n-1)*6. This is derived from the general formula for an arithmetic sequence and using the given first two terms.
Explanation:In this given problem, we have an arithmetic sequence. An arithmetic sequence is a list of numbers in which each term is obtained by adding a constant difference to the preceding term. For this particular sequence, the first term (a1) is 13, and the second term (a2) is 19. Hence, the common difference (d) between the terms is 19 - 13 = 6.
The general formula for the nth term (an) of an arithmetic sequence is given by an = a1 + (n-1)*d. In this situation, to represent any term in the series, the formula would be an = 13 + (n-1)*6. This formula can generate any term in the sequence, given the term number.
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Help with this exercise
Answer:
View Image
Step-by-step explanation:
Solve for y.
You have a ≥ so it's a solid line and you shade above that line.
Rosita earns money by walking dogs after school and on weekends.She walks Madeline every other day,buddy every fourth day,and ernie every third day.Today she walked all three dogs. What day did she walk all three dogs?
On 12th day Rosita will walk all three dogs
Solution:
Given that Rosita earns money by walking dogs after school and on weekends
She walks Madeline every other day,buddy every fourth day,and ernie every third day
Today she walked all three dogs
To find: the day when she walked all three dogs
From given question,
Madeline is walked every other day means every two days: 2
Buddy is walked every fourth day: 4
Ernie is walked every third day: 3
To find the day when she walked all three dogs, we have to find the least common multiple (LCM) of 2, 4, 3
L.C.M of 2, 4, 3:
List all prime factors for each number
Prime Factorization of 2 shows:
2 is prime => [tex]2^1[/tex]
Prime Factorization of 3 shows:
3 is prime => [tex]3^1[/tex]
Prime Factorization of 4 is:
[tex]2 \times 2 = 2^2[/tex]
For each prime factor, find where it occurs most often as a factor and write it that many times in a new list.
The new superset list is
2, 2, 3
Multiply these factors together to find the LCM.
LCM = 2 x 2 x 3 = 12
Thus on 12th day Rosita will walk all three dogs
1. Question: What is the number of the parking space covered by the car?
20 seconds to solve the problem!
will get brainiest ;b
Answer: the number of the parking space covered by the car is 87
Step-by-step explanation:
Numbers are assigned to each parking spot. Looking closely at the numbers assigned to each spot, the numbers are inverted and the number on each successive spot differ by one. The numbers are 86, 87, 88, 89, 90, 91
Therefore, the number assigned to the spot where the car would be 87
Distributive property you want to buy three books that are on sale at 20% off. The original prices of the books are $2.50, $4.95, andb$6.00. How much will you save?
Answer:
The saving amount on selling of three books together after discount of 20% is $2.69
Step-by-step explanation:
Given as :
The original price of first book = $2.50
The original price of second book = $4.95
The original price of third book = $6.00
The total percentage discount on the book = d = 20%
Let The saving money after purchased of book = $x
And Let the selling price of the book = s.p = $y
Now, According to question
The total market price of three books = m.p = $2.50 + $4.95 + $6.00
I.e m.p = $13.45
Now, from discount formula
Discount % = [tex]\dfrac{market price - selling price}{market price}[/tex]
Or, d% = [tex]\dfrac{m.p - s.p}{m.p}[/tex]
Or, 20% = [tex]\dfrac{13.45 - y}{13.45}[/tex]
Or, [tex]\dfrac{20}{100}[/tex] = [tex]\dfrac{13.45 - y}{13.45}[/tex]
Or, 20 × 13.45 = (13.45 - y) × 100
Or, 269 = 1345 - 100 y
Or, 100 y = 1345 - 269
Or, 100 y = 1076
∴ y = [tex]\dfrac{1076}{100}[/tex]
i.e y = $10.76
So, The selling price of three books = y = $10.76
∴ The saving amount on selling of three books together after discount of 20% = x = Total market price - Selling price
i.e x = m.p - y
or, x = $13.45 - $10.76
or, x = $2.69
Hence ,The saving amount on selling of three books together after discount of 20% is $2.69 Answer
Stella Blue gets in a serious car accident 2 months after buying a new policy and only paying $700 in premiums. Her insurer had to pay $500,000; this is an example of what type insurance contract characteristic?
Answer:
Aleatory
Step-by-step explanation:
This is an example of Aleatory type of insurance contact.
Definition:
A contract preoccupied with an unclear occurrence that delivers for imbalanced transfer of worth between the parties. Insurance plans are discretionary investments and, after sustaining a reported loss, a person must pay premiums for many years. Most insurance policies are aleatory contacts.
PLZ HELP ASAP 15 pts
Which of the following tables represents a function?
x 4 4 9 9
y 2 −2 3 −3
x 2 −2 3 −3
y 4 4 9 −9
x 1 −1 1 −1
y 4 5 6 7
x 5 5 6 6
y 1 2 3 4
Answer:
x 2 −2 3 −3
y 4 4 9 −9
Step-by-step explanation:
A table does not represent a function if any x-value is repeated. The table shown above is the only one with unique x-values.
Accounts Payable 420 Accounts Receivable 3,200 Capital Stock 240 Cash 100 Cost of Goods Sold 600 Inventory 380 Long-term Debt 4,640 Net Income 280 Property, Plant, and Equipment (net) 1,400 Retained Earnings (220) Sales 3,000 Note: The retained earnings amount reported is as of the END of the year (after the closing entries have been made). The number of shares outstanding is 100. Compute BOOK VALUE PER SHARE.
Answer:
??????????????????? what
A college infirmary conducted an experiment to determine the degree of relief provided by three cough remedies. Each cough remedy was tried on 50 students and the accompanying data recorded. Test the hypothesis that the three cough remedies are equally effective. Use a P-value in your conclusion.
Answer:
[tex]p_v = P(\chi^2_{4,0.05} >3.81)=0.43233[/tex]
Since the p values is higher than the significance level we FAIL to reject the null hypothesis at 5% of significance, and we can conclude that we don't have significant differences between the 3 remedies analyzed. So we can say that the 3 remedies ar approximately equally effective.
Step-by-step explanation:
A chi-square goodness of fit test "determines if a sample data matches a population".
A chi-square test for independence "compares two variables in a contingency table to see if they are related. In a more general sense, it tests to see whether distributions of categorical variables differ from each another".
Assume the following dataset:
NyQuil Robitussin Triaminic Total
No relief 11 13 9 33
Some relief 32 28 27 87
Total relief 7 9 14 30
Total 50 50 50 150
We need to conduct a chi square test in order to check the following hypothesis:
H0: There is no difference in the three remedies
H1: There is a difference in the three remedies
The level os significance assumed for this case is [tex]\alpha=0.05[/tex]
The statistic to check the hypothesis is given by:
[tex]\sum_{i=1}^n \frac{(O_i -E_i)^2}{E_i}[/tex]
The table given represent the observed values, we just need to calculate the expected values with the following formula [tex]E_i = \frac{total col * total row}{grand total}[/tex]
And the calculations are given by:
[tex]E_{1} =\frac{50*33}{150}=11[/tex]
[tex]E_{2} =\frac{50*33}{150}=11[/tex]
[tex]E_{3} =\frac{50*33}{150}=11[/tex]
[tex]E_{4} =\frac{50*87}{150}=29[/tex]
[tex]E_{5} =\frac{50*87}{150}=29[/tex]
[tex]E_{6} =\frac{50*87}{150}=29[/tex]
[tex]E_{7} =\frac{50*30}{150}=10[/tex]
[tex]E_{8} =\frac{50*30}{150}=10[/tex]
[tex]E_{9} =\frac{50*30}{150}=10[/tex]
And the expected values are given by:
NyQuil Robitussin Triaminic Total
No relief 11 11 11 33
Some relief 29 29 29 87
Total relief 10 10 10 30
Total 50 50 50 150
And now we can calculate the statistic:
[tex]\chi^2 = \frac{(11-11)^2}{11}+\frac{(13-11)^2}{11}+\frac{(9-11)^2}{11}+\frac{(32-29)^2}{29}+\frac{(28-29)^2}{29}+\frac{(27-29)^2}{29}+\frac{(7-10)^2}{10}+\frac{(9-10)^2}{10}+\frac{(14-10)^2}{10} =3.81[/tex]
Now we can calculate the degrees of freedom for the statistic given by:
[tex]df=(rows-1)(cols-1)=(3-1)(3-1)=4[/tex]
And we can calculate the p value given by:
[tex]p_v = P(\chi^2_{4,0.05} >3.81)=0.43233[/tex]
And we can find the p value using the following excel code:
"=1-CHISQ.DIST(3.81,4,TRUE)"
Since the p values is higher than the significance level we FAIL to reject the null hypothesis at 5% of significance, and we can conclude that we don't have significant differences between the 3 remedies analyzed.
To test the hypothesis that three cough remedies are equally effective, conduct an Analysis of Variance (ANOVA) test and use the p-value, compared to the pre-set level of 0.05, to decide if the null hypothesis should be rejected or failed to reject.
Explanation:The subject matter pertains to hypothesis testing, a method used in statistics to test the validity of a claim (hypothesis) about a population. In this case, the null hypothesis in your question is that the three cough remedies are equally effective. The alternative hypothesis (Ha) is that at least one of the remedies is different. The P-value, when set at 0.05, helps to decide on the rejection or non-rejection of the null hypothesis, depending on whether it’s greater or smaller than the P-value.
First, we need to perform an Analysis of Variance (ANOVA) test since we have more than two samples to compare. After conducting the test, we compare the P-value with our pre-set alpha (0.05). If the p-value obtained is less than 0.05, we can reject the null hypothesis, letting us conclude that not all cough remedies are equally effective. If, however, the p-value is more than 0.05, we fail to reject the null hypothesis, and hence, we can't confidently say that one cough remedy is more effective than the others.
Remember that failing to reject the null hypothesis does not prove it true, it only suggests that there's not enough evidence against it given our data and chosen significance level.
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This should be easy for you
Please help me
Explanation:
a. The line joining the midpoints of the parallel bases is perpendicular to both of them. It is the line of symmetry for the trapezoid. This means the angles and sides on one side of that line of symmetry are congruent to the corresponding angles and sides on the other side of the line. The diagonals are the same length.
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b. We observe that adjacent pairs of points have the same x-coordinate, so are on vertical lines, which have undefined slope. KN is a segment of the line x=1; LM is a segment of the line x=3. If the trapezoid is isosceles, the midpoints of these segments will be on a horizontal line. The midpoint of KN is at y=(3-2)/2 = 1/2. The midpoint of LM is at y=(1+0)/2 = 1/2. These points are on the same horizontal line, so the trapezoid is isosceles.
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c. We observed in part (b) that the parallel sides are KN and LM. The coordinate difference between K and L is (1, 3) -(3, 1) = (-2, 2). That is, segment KL is the hypotenuse of an isosceles right triangle with side lengths 2, so the lengths of KL and MN are both 2√2.
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For part (c), we used the shortcut that the hypotenuse of an isosceles right triangle is √2 times the leg length.
solve
5x + y = 13
3x = 15 – 3y
Answer:
Solution
(x, y) = (2, 3)
Step-by-step explanation:
Simplify. 2( 5 3 + 3 4 ) − 4 3
Firefighters dig a triangular trench around a forest to prevent the fire from spreading. Two of the trenches are 800 m long and 650 m long. the angle between them is 30°. Determine the area that is enclosed by these trenches.
Answer:
130000m^2
Step-by-step explanation:
a = 800m
b = 800m
c= 650m
α = 30°
4th he triangular trench is an isosceles triangle.
Area of a triangle = 1/2(bcsinA)
= 1/2(800*650*sin30°)
= 130,000m^2
Answer:
The area enclosed by the trenches is 130 000[tex]m^{2}[/tex]
Step-by-step explanation:
The two given sides of the trenches are 800m and 650m. Since the included angle of the two sides are given, then the area covered by the trenches can be calculated using the formula;
Area of a triangle = [tex]\frac{1}{2}[/tex] × abSin C
where: a is the length of one side and b the length of the second side and C represents the value of the included angle.
Thus,
a = 800m, b = 650m and C = 30°
So that,
Area enclosed by the trenches = [tex]\frac{1}{2}[/tex] × abSin C
= [tex]\frac{1}{2}[/tex] × 800 × 650 × Sin30°
= [tex]\frac{1}{2}[/tex] × 800 × 650 × 0.5
= 130 000
The area enclosed by the trenches is 130 000[tex]m^{2}[/tex].
Each month, Daddy gives barbara $50 . From that barbara saves $20 each month and spends the rest . How much money would barbara have spent in 5 months
Answer:
$150
Step-by-step explanation:
Dad gives the girl 50 and she save 20 so 50-20 = 30. Then u multiply that by the number of months given...so 30*5= 150
Answer: 150
Step-by-step explanation:
50-20=30
30x5=150
Water flows straight down from an open faucet. The cross-sectional area of the faucet is 1.9 × 10-4m2 and the speed of the water is 0.75 m/s as it leaves the faucet. Ignoring air resistance, find the cross-sectional area of the water stream at a point 0.10 m below the faucet.
Answer:
[tex]8\times10^5m^2[/tex]
Step-by-step explanation:
To find the cross-section area at a point below the faucet
we can use following equations
[tex]v_1^2=v_2^2+2ay[/tex]
and equation of continuity
[tex]A_1v_1=A_2v_2[/tex]
v_1= velocity at the out let
v_2= velocity at the inlet (faucet)= 0.75 m/s
y = distance below the faucet = 0.10 m
A_1= cross-sectional area of the water stream at a point 0.10 m below the faucet.
A_2= area of faucet= 1.9 × 10-4m2
from above two equation we can write
[tex]A_1= \frac{A_2v_2}{\sqrt{v_2^2+2ay} }[/tex]
now putting the values we get
[tex]A_1= \frac{1.9\times10^{-4}\times0.75}{\sqrt{0.75^2+2\times9.80\times0.10} }[/tex]
A_1= 0.00008= [tex]8\times10^5[/tex]
The width of a rectangle, in feet, is represented by left parenthesis 3 x minus 1.5 right parenthesis. The length of the rectangle, in feet, is represented by left parenthesis 1.25 x plus 3 right parenthesis. Find the perimeter of the rectangle.
Given the width and length of the rectangle in terms of x, the formula for the perimeter is substituted with these expressions. After simplifying, the perimeter of the rectangle is found to be represented by the equation 8.5x + 3.
Explanation:The subject represents a problem in mathematics, specifically geometry. The perimeter of a rectangle is calculated by the formula 2(width + length). Given that the width is meant to be represented by (3x - 1.5) and the length is represented by (1.25x + 3), we substitute these expressions into our formula to find the perimeter of the rectangle.
Perimeter = 2[(3x - 1.5) + (1.25x + 3)].
To simplify, the above equation becomes:
Perimeter = 2[4.25x + 1.5],
which then further simplifies to:
Perimeter = 8.5x + 3.
The perimeter of the rectangle is therefore represented by the expression 8.5x + 3.
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The total number of relative maximum and minimum points of the function whose derivative is f ' (x) = x2(x + 1)3(x – 4)3 is (A) 0 (B) 1 (C) 2 (D) 3 (E) 4 ______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ 12. Find all absolute and relative
The function's derivative, f'(x) = x²(x + 1)³3(x - 4)³, has 2 relative maximum and minimum points.
So, the correct answer is C) 2.
Explanation:The function's derivative, f'(x) = x²(x + 1)³3(x - 4)³, gives us information about the critical points of the function. Relative maximum and minimum points occur where the derivative is zero or undefined. To find these points, we set the derivative equal to zero and solve for x: x²(x + 1)³3(x - 4)³ = 0. By analyzing the signs of the factors, we can determine the number of relative maximum and minimum points:
When x = 0, both x² and (x + 1)³ are negative, while (x - 4)³ is positive. So, this point is a relative maximum.When x = -1, both x² and (x - 4)^3 are negative, while (x + 1)³ is positive. So, this point is a relative minimum.When x = 4, both (x + 1)³ and (x - 4)³ are positive, while x² is zero. As (x + 1)³and (x - 4)³ are both cubed, this point represents a saddle point rather than a relative maximum or minimum.Therefore, the total number of relative maximum and minimum points is 2.
So, the correct answer is C) 2.
Three friends pay $1,025 to rent a vacation home. Beth contributed $80 more than Danny. Katie contributed $20 less than Beth. How much did Danny contribute?
Answer:
$295
Step-by-step explanation:
Let d represent the amount Danny contributed. Then Beth contributed (d+80) and Katie contributed ((d+80)-20) = (d+60). The total from the three friends is ...
d + (d+80) +(d+60) = $1025
3d = 885 . . . . . . . . . . . . . . . . . . . subtract 140
d = 295 . . . . . . . . . . . . . . . . . . . . divide by 3; Danny's contribution
Danny contributed $295.
The combined ages of a dog and his owner are 96 years in total. The owner is 3 times older than his dog. How old is the owner?
Answer:
72 yrs old.
Step-by-step explanation:
The combined age
D+O=96
The owner is 3 times older than dog
O=3D
D+3D=96
4D = 96
D= 24
Now substitute the value of D in O=3D
O=3.24= 72
The owner is 72 years old.
To solve this problem, we can use algebra. Let's define the dog's age as 'd' and the owner's age as 'o'. By solving the two equations (o + d = 96 and o = 3d), we can determine that the dog is 24 years old and the owner is 72 years old.
Explanation:The question asks us to find the age of a dog's owner, given that the combined ages of the owner and the dog are 96 years, and the owner's age is three times the age of the dog. We can use algebra to solve this problem.
Let's define the dog's age as 'd' and the owner's age as 'o'. We know that o = 3d (the owner's age is three times the dog's age) and o + d = 96 (the combined ages of the owner and the dog are 96).
To find the owner's age, substitute '3d' for 'o' in the second equation: 3d + d = 96. This simplifies to 4d = 96. Dividing both sides of the equation by 4 gives us d = 24, meaning the dog is 24 years old. Now we substitute d = 24 into the equation o = 3d, resulting in o = 72. Therefore, the owner is 72 years old.
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Elise is making necklaces. She has 15 purple beads and 12 yellow beads. If Elise wants to make all the necklaces exactly the same with no beads left over, what is the greatest number of necklaces she can make?
Answer:
3 necklaces.
Step-by-step explanation:
According to the Question,
Elise is having 15 Purple beads and 12 Yellow beads ,
All necklace should be the same ,
So, She wants to form group such that in each group , equal number of Purple and Yellow beads will be present.
Now , the maximum number of such necklaces can be calculated from the HCF of 15 and 12 as we want to break them in equal groups .
Now , HCF of 15 and 12 comes out to be 3.
Thus ,
a maximum of 3 necklaces can be made.
Which of the following is the slope of the line?
Help ASAP PLZ
Answer: the second option is the correct answer
Step-by-step explanation:
Slope, m =change in value of y on the vertical axis / change in value of x on the horizontal axis
change in the value of y = y2 - y1
Change in value of x = x2 -x1
y2 = final value of y
y 1 = initial value of y
x2 = final value of x
x1 = initial value of x
From the information on the graph y2 = - 1
y1 = - 2
x2 = 4
x1 = 0
Slope = ( - 2 - - 1)/(4 - 0) = - 1/4
Answer:
[tex]\frac{1}{4}[/tex]
Step-by-step explanation:
To find the slope of a line we need two points through which it is passing.
From the figure, we can see that the line passes through (0,-2) and (4,-1).
Slope of a line passing through two points [tex](x_{1},y_{1})\ and\ (x_{2},y_{2})[/tex] is given by the formula:
[tex]\frac{y_{2}-y_{1}}{x_{2}-x_{1}}[/tex]
Here x1=0 y1=-2 x2=4 y2=-1
Slope = [tex]\frac{-1-(-2)}{4-0}=\frac{1}{4}[/tex]
Hence the slope of the line is [tex]\frac{1}{4}[/tex]