Answer:
B. 315 mi.
Step-by-step explanation:
180 ÷ 4 = 45
45 x 7 = 315
or...
180 ÷ 4 = 45
45 x 3 = 135
135 + 180 = 315
I hope this helps!
Cheers, July.
The train travels option B. 315 miles in 7 hours.
What is Speed?Speed is the unit rate in terms of distance travelled by an object and the time taken to travel the distance.
Speed is a scalar quantity as it only has magnitude and no direction.
Given that,
Distance train travelled = 180 miles
Time taken to travel the distance = 4 hours
Speed = Distance / Time
= 180 / 4
= 45 miles per hour
Also, given that train travels at constant speed.
Distance = Speed × Time
Since speed is constant, the distance train travelled in 7 hours will be,
Distance = 45 × 7
= 315 miles
Hence the distance train travelled in 7 hours is 315 miles.
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i need help 6 7 is due tommorw pls help
Answer:6: 8.64
7: 584
Step-by-step explanation:
48×.18=8.64
800×.73=584
Hope this helps
Answer:
Answer for question number 7 is 58.4
Step-by-step explanation:
Identify y = sec(x)
Answer:
D)
Step-by-step explanation:
sec(x) = 1/cos(x)
You know cos(x) = 1 for x=0, so sec(0) = 1.
You also know that sec(x) has vertical asymptotes where cos(x) = 0, at odd multiples of π/2. Only selection D matchest these characteristics.
What is the metric system prefix for the quantity 0.000001?
Answer:
Prefix Symbol Multiplier
deci d 0.1
centi c 0.01
milli m 0.001
micro µ 0.000001
Step-by-step explanation:
Question is 15 points
Answer:
sec theta = r/v
Step-by-step explanation:
sec theta = 1 / sin theta
We know that sin theta = opp/ hypotenuse
1 / sin theta = hypotenuse / opp
sec theta = hypotenuse / opp
sec theta = r/v
Wind farms are a source of renewable energy found around the world. The power P (in kilowatts) generated by a wind turbine varies directly as the cube of the wind speed v (in meters per second). If a turbine generates 500kW in a 10m/s wind, how much power does it generate in a 12 m/s wind?
Show all your step please.
Answer:
600kW
Step-by-step explanation:
Referring to the fact that 10m/s of wind is 500kW so divide 500 by 10.
500/10=50
So there is 50 kW is 1m/s of wind. Now multiply 12 by 50
12x50=600
So for 12m/s of wind there is 600kW
At 12 m/s, the turbine generates 864 kW.
We can express the given relationship as P = k * v^3, where k is a constant of proportionality.
Given that a turbine generates 500 kW at a wind speed of 10 m/s, we can find k using the equation:
500 = k * 10^3
k = 500 / 1000
k = 0.5.
Now, to find out how much power the turbine would generate at 12 m/s. The calculation is :
P = 0.5 * 12^3
P = 0.5 * 1728
P = 864 kW.
The wind turbine generates 864 kW in a 12 m/s wind.
Which of the following shows 18/12 as a mixed number and 1 7/8 as an improper fraction
18/12= [tex]1\frac{1}{2}[/tex] and [tex]1\frac{7}{8}[/tex] = 15/8 is the correct option, [tex]1\frac{1}{2}[/tex] is mixed fraction of 18/12 and 15/8 is improper fraction of [tex]1\frac{7}{8}[/tex].
What is Fraction?
A fraction represents a part of a whole.
If a fraction has a numerator that is less than the denominator then the fraction is proper.
An improper fraction has a numerator that is greater than the denominator.
A mixed number is an integer written with a fraction.
18/12 is a improper fraction, let us simplify it by dividing numerator and denominator by 6
18/12 is 3/2.
The mixed fraction of 3/2 is [tex]1\frac{1}{2}[/tex]
Now the given mixed fraction is [tex]1\frac{7}{8}[/tex]
When we convert to improper we get (8×1)+7/8 , which is 15/8
Hence, 18/12= [tex]1\frac{1}{2}[/tex] and [tex]1\frac{7}{8}[/tex] = 15/8 is the correct option, [tex]1\frac{1}{2}[/tex] is mixed fraction of 18/12 and 15/8 is improper fraction of [tex]1\frac{7}{8}[/tex].
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If the speed was 65 for 1 minutes and drove at a constant speed for 5.5 minutes for a linear equation
Answer:
65,1,5.5
Step-by-step explanation:
Replace with 1 and simplify.
Which choice describes whether x = 19 is the solution of the equation 42 = 3x – 15? CLEAR CHECK x = 19 is not the solution because 3 • 19 – 15 = 3 • 4 = 12, not 42. x = 19 is the solution because 3 • 19 – 15 = 3 • 4 = 12. x = 19 is the solution because 3 • 19 – 15 = 57 – 15 = 42. x = 19 is not the solution because 3 • 19 – 15 = 57 – 15 = 42.
The choice that describes whether x = 19 is the solution of the equation 42 = 3x - 15 is that x = 19 is the solution because 3 * 19 - 15 = 57 - 15 = 42.
Explanation:The choice that describes whether x = 19 is the solution of the equation 42 = 3x - 15 is the option: x = 19 is not the solution because 3 * 19 - 15 = 3 * 4 = 12, not 42.
To check if a value is the solution to an equation, we substitute the value into the equation and perform the necessary calculations. In this case, substituting x = 19 into the equation 42 = 3x - 15 gives us 42 = 3 * 19 - 15 = 57 - 15 = 42. Since both sides of the equation are equal, x = 19 is indeed the solution.
The question is asking to determine if x = 19 is the solution for the equation 42 = 3x – 15. To verify this, we need to substitute x = 19 into the equation. So, we have 42 = 3(19) - 15 which simplifies to 42 = 57 - 15. After subtraction on the right side, we get 42 = 42, which is a true statement. Hence, x = 19 is indeed the solution to the equation 42 = 3x – 15.
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what is 78,045 rounded to the nearest thousand?
Final answer:
78,045 rounded to the nearest thousand is 78,000. You round down because the hundreds digit (0) is less than 5. This approach to rounding applies in various arithmetic contexts.
Explanation:
To round 78,045 to the nearest thousand, we need to consider the hundreds digit, which is 0. In rounding, if the hundreds digit is 5 or greater, we would round up. However, because it is 0, we keep the thousands digit the same and replace all subsequent digits with zeros. Thus, 78,045 rounded to the nearest thousand is 78,000.
When dealing with whole numbers and rounding to a certain place value, it is crucial to look at the number to the immediate right of the place value you are rounding to. If this number is 5 or higher, you round up. Otherwise, you round down. This principle is true regardless of whether you are serving a subtraction operation, like 78,500 m - 362 m which rounds to 78,100 m, or if you're dealing with large numbers in scientific notation, such as 79,345 which can be represented as 7.9345 × 104.
HEEEEEEEEEELPPPPPPPPPPP PLEASE GIVING BRAILIENST TO WHOEVER HELPS ME
Answer:
Same side: 4, 1.5, 5/3, 0.2
Opposite side: -5, -1/4
Step-by-step explanation:
We know that dilation caused by a positive factor leads to the object being on the same side and dilation caused by a negative factor leads to the object being on the opposite side. Therefore, the dilation caused by positive numbers 4, 1.5, 5/3, 0.2 will lead to object being on the same side. And dilation caused by a negative numbers -5 and -1/4 will lead to object being reflected to the opposite side
Someone plz help me on this!!!
Answer:
(-4,1)
Step-by-step explanation:
Answer:
A
Step-by-step explanation:
If a certain cannon is fired from a height of 9.1 meters above the ground, at a certain angle, the height of the cannonball above the ground, h, in meters, at time, t, in seconds, is found by the function h(t) = -4.9t² + 27.5t + 9.1. Find the time it takes for the cannonball to strike the ground.
The cannonball will strike the ground after about ___ seconds.
(Type an integer or a decimal. Round to the nearest hundredth as needed.)
Answer:
The cannonball will hit the ground after about 5.926 seconds.
Step-by-step explanation:
h(t) = -4.9t² + 27.5t + 9.1
If you graphed the function on a graph, the cannonball would be hitting the ground when the function crossed the x-axis at 0. So, to solve this arithmetically, you just need to set h(t) equal to 0.
-4.9t² + 27.5t + 9.1 = 0 Plug this into a calculator if you have one, if not solve with the quadratic formula.
[tex]\frac{-27.5 \pm \sqrt{(27.5^2) - 4(-4.9)(9.1)} }{2(-4.9)}[/tex]
t = -.0313
t = 5.9256
Since time can't be negative, you know your answer will be 5.926 seconds.
Answer:
t =5.93 seconds
Step-by-step explanation:
h(t) represents the height of the cannon ball. Zero is when the ball will hit the ground. Substitute zero for h(t).
0 = -4.9t² + 27.5t + 9.1
This is a complicated quadratics, so we will need to use the quadratic formula to solve
-b ± sqrt(b^2 -4ac)
-----------------------------
2a
where a = -4.9 b = 27.5 and c = 9.1
-27.5 ± sqrt(27.5 ^2 -4 (-4.9) 9.1)
-----------------------------------------------
2(-4.9)
-27.5 ± sqrt(756.25 +178.36)
-----------------------------------------------
-9.8
-27.5 ± sqrt(943.61)
-----------------------------------------------
-9.8
-27.5 ± 30.57139186
-----------------------------------------------
-9.8
3.071391856/-9.8 or -58.07139186/-9.8
-.313407332 or 5.925652231
But time cannot be negative, the ball cannot land before it takes off,
so t= 5.925652231 seconds
Rounding to the nearest hundredth
t =5.93 seconds
Miguel deposits $680 in an account that pays 3.5% simple interest. If he neither adds more money not withdraws any money, what amount will be in the account after 6 years?
Answer:835.893
Step-by-step explanation:
do the interest rate thing you learned in class
if you didn't learn it im adding a picture on the bottom for help
Christopher bought a new watch at the store when they were having a 20\%20% off sale. If the regular price of the watch was \$48$48, how much did Christopher pay with the discount? \$\
Answer:
38.4
Step-by-step explanation:
48*20%=9.6 48-9.6=38.4
The exponential distribution is frequently applied to the waiting times between successes in a poisson process. if the number of calls received per hour by a telephone answering service is a poisson random variable with parameter λ = 6, we know that the time, in hours, between successive calls has an exponential distribution with parameter β =1/6. what is the probability of waiting more than 15 minutes between any two successive calls?
The question requires us to use the exponential distribution to calculate the probability of waiting more than 15 minutes between two successive calls given a Poisson process with β parameter 1/6. We achieve this by using the cumulative distribution function. The probability is approximately 96.4%.
Explanation:This question is essentially asking us to use the exponential distribution to calculate the probability of waiting for more than 15 minutes (which is 0.25 hour because we are dealing with hours as units of time) between two successive calls when the parameter β =1/6 is given. The exponential distribution is used to model the time between events in a Poisson process, and the probability density function is given by f(x) = βe^(-βx) for x ≥ 0.
The cumulative distribution function is F(x) = 1 - e^(-βx), so to compute the probability of waiting time that is more than 0.25 hour, we subtract the cumulative distribution function from 1.
So, P(X > 0.25) = 1 - P(X ≤ 0.25) = 1 - [1 - e^(-β * 0.25)] = e^(-β * 0.25) = e^(-(1/6) * 0.25) ≈ 0.964, or 96.4% as the answer.
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Michelle has a maximum of 4500 milliliters of water for her plants today. Each basil plant requires 350 of water, and each fennel plant requires 525 of water. Write an inequality that represents the number of basil plants (B)(B)left parenthesis, B, right parenthesis and fennel plants (F) Michelle can water today.
Answer:
Let B represents the number of basil plants and F represents the number of fennel plants,
As per the given condition: Michelle has a maximum of 4500 milliliters of water for her plants today. Each basil plant requires 350 of water, and each fennel plant requires 525 of water.
Each basil plant require 350 of water
⇒ total number of basil plant require water = 350B
Each Fennel plant require 525 of water.
⇒ total number of fennel plant require water = 525F
Since, Michelle has a maximum of 4500 milliliters of water;
then;
[tex]350B+525F \leq 4500[/tex]
Therefore, an inequality that represents the number of basil plants(B) and fennel plants can water today is; [tex]350B+525F \leq 4500[/tex]
please help me will give braneliest
Answer:
3/40
Step-by-step explanation:
After you multiply across, you get 3/40. Since these two numbers don't have common multiples, it just stays as 3/40
Answer:
the third option
Step-by-step explanation:
1*3= 3
10*4= 40
3/40
Which expression is equal to (x-3)(2x^2-x+3)
Answer: 2x^3 - 7x^2 + 6x - 9 which is choice D
=========================================
Work Shown:
One way is to use the distribution rule two times
(x-3)(2x^2-x+3) = y(2x^2-x+3) ........... replace (x-3) with y
(x-3)(2x^2-x+3) = y(2x^2)+y(-x)+y(3) .... distribution rule
(x-3)(2x^2-x+3) = 2x^2*(y) - x(y) + 3(y)
(x-3)(2x^2-x+3) = 2x^2*(x-3) - x(x-3) + 3(x-3) .... replace y with x-3
(x-3)(2x^2-x+3) = 2x^3-6x^2 - x^2 + 3x + 3x - 9 ... distribution rule
(x-3)(2x^2-x+3) = 2x^3 - 7x^2 + 6x - 9
----------------------------
Or we can use the box method (see the attached image below). This is a visual way to organize the terms. You'll probably notice that the box method is basically the distribution rule. Each row is one distribution being applied. In row 1, we have x distributed to (2x^2-x+3). In row 2, we have -3 distributed to (2x^2-x+3). I color coded the table cells to highlight the like terms. Those like terms combine to -6x^2-x^2 = -7x^2 and 3x+3x = 6x as shown in the steps for the distribution above.
Each interior cell in the box is found by multiplying the corresponding outer terms. For example, in the first row, first column we have x^3 which is the result of multiplying the outer x and x^2 terms.
The correct choice is D) [tex]\(2x^3 - 7x^2 + 6x - 9\)[/tex].
To find the product[tex]\((x - 3)(2x^2 - x + 3)\)[/tex], we can use the distributive property:
[tex]\((x - 3)(2x^2 - x + 3) = x(2x^2 - x + 3) - 3(2x^2 - x + 3)\)[/tex]
Now, distribute the terms:
[tex]\[= x \cdot 2x^2 - x^2 + 3x - 3 \cdot 2x^2 + 3x - 9\][/tex]
Combine like terms:
[tex]\[= 2x^3 - x^2 + 6x - 6x^2 + 6x - 9\][/tex]
Combine the x terms:
[tex]\[= 2x^3 - 7x^2 + 6x - 9\][/tex]
Therefore, the expression [tex]\((x - 3)(2x^2 - x + 3)\)[/tex] is equal to \[tex](2x^3 - 7x^2 + 6x - 9\)[/tex].
So, the correct choice is D) [tex]\(2x^3 - 7x^2 + 6x - 9\)[/tex].
a line in the standard (x,y) coordinate plane contains the points M(-2,4) and N(8,10) What is the midpoint of MN
Answer:
(3, 7)
Step-by-step explanation:
The midpoint of a line joining the points (x1, y1) and (x2, y2) has midpoint
[(x1 + x2)/ 2]. (y1 + y2)/2 ]
Substituting the given points:-
Midpoint of MN = (-2 + 8)/2 , (4 + 10)/2
= 6/2 , 14/2
= (3, 7) (answer)
You will flip a coin five times. How many ways can you get three heads and two tails?
Jill is trying to solve this probability question. Which row in Pascal's Triangle would tell her the number of outcomes for this event?
A) second row
B) third row
C) fifth row
D) sixth row
Answer:
10 ways, 6th row
Step-by-step explanation:
You will flip a coin five times and get three heads and two tails. You can get it in
[tex]C_5^3=\dfrac{5!}{3!(5-3)!}=\dfrac{1\cdot 2\cdot 3\cdot 4\cdot 5}{1\cdot 2\cdot 3\cdot1\cdot 2}=10[/tex]
different ways.
6th row tells her the number of favorable outcomes for this event.
15 boys and 16 girls took part in the basketball competition. What is the ratio of the number of girls to the number of boys who participate in the competition?
Answer:
The ratio of girls to boys is 16:15
Step-by-step explanation:
To find this, we simply start by using the words.
Girls:Boys
Now we plug in the values.
16:15
Given f(x) = 3x - 1 and g(x)= -x + 6, find f(-2) + g(5).
-6
6
8
Answer:
6
Step-by-step explanation:
f(x) = 3x - 1
f(2) means evaluate f(x) when x=2
f(2) = 3(2) -1
f(2) = 6-1=5
g(5) means evaluate g(x) when x=5
g(5) = -5+6
g(5) =1
f(-2) + g(5)
5+1
6
Answer:
6
Step-by-step explanation:
By which rule are these triangles congruent? A) AAS B) ASA C) SAS D) SSS
Answer:
it would be SSS...
Step-by-step explanation:
Its meaning is "side side side''... so you see how the triangle, ABD has the dashed (same number of lines) through the lines of the triangle, it means the sides are all congruent meaning that the sides are the same
Answer:
The triangles are not congruent.
Step-by-step explanation:
The triangle ABD is an equilateral triangle, then all their sides are equal and all the angles are equal to 60º. Then x=60º and y=30º (because the sum of the internal angles of a triangle have to be 180º)
Then we can conclude that the triangles are not congruent because they share two sides, but does no have any angle in common, as we can see in the next list of the angles.
Triangle ABDangle ADB= angle ABD= angle DAB=60º
TriangleBCDangle BDC=30º
angle DCB=30º
angle CBD=120º
Julian used these steps to solve the equation 9x=?6+3(3x+2) 9 x = - 6 + 3 ( 3 x + 2 ) . Which choice describes the meaning of his result, 0=0 ?
Answer:
see explanation
Step-by-step explanation:
the result 0 = 0
means the equation has an infinite number of solutions
Answer:
All values of x make the equation true... THIS IS THE CORRECT ANSWER!
Step-by-step explanation:
at the production Stars you stores you can buy four bags of bananas for 2084 how much would it cost if you were three bags
63÷10 63÷10^2 63÷10^3. Please answer these equation and type the answer in the space below in the comment section THX and have a awesome day:)
Answer:
The answer is 63/10, 63/100, 63/1000
what is the slope of the line on this graph?
Answer: 3
Step-by-step explanation:
The slope of a line passing through two points (a,b) and (c,d) is given by :-
[tex]\text{Slope}=\dfrac{d-b}{c-a}[/tex]
In the given graph , the line is passing through (0,0) and (1,3) .\
Then the slope of line passing through (0,0) and (1,3) will be :-
[tex]\text{Slope}=\dfrac{3-0}{1-0}\\\\\Rightarrow\ \text{Slope}=3[/tex]
Hence, the slope of the given line= 3
Trig-Please help ASAP! Use either the law of cosines or the law of sines to find the measure of angle C
Answer:
C = 81.6 degrees
Step-by-step explanation:
The formula for law of sines
sin A sin B sin C
-------- = ----------- = -------------
a b c
Looking at the diagram, we know A = 54, b = 7.4 and c = 15.8
not enough to use the law of sines
We will need to use the law of cosines
a^2 = b^2 + c^2 - 2ac cos A
Using the law of cosines, we can calculate the length of a
a^2 = 7.4^2 + 15.8^ -2*7.4*15.8 cos 54
a^2 = 54.6+249.64-233.84cos54
a^2 =166.7922966
a = 12.921
Now we can use the law of sines to find C
sin 54 sin C
-------- = -------------
12.921 15.8
Using cross products
15.8 * sin 54 = 12.921 * sin C
Divide each side by 12.921
15.8 /12.921 * sin 54 = sin C
Take the arcsin of each side
arcsin (15.8 /12.921 * sin 54) = arcsin (sin C)
arcsin (15.8 /12.921 * sin 54) = C
C = 81.6 degrees
A scale drawing of a house uses a scale of 0.5 inches = 2 feet. What is the length, in inches, of a line on the scale drawing that represent an actual length of 5 feet?
Final answer:
To find the scaled length of a line representing 5 feet on a scale drawing with a scale of 0.5 inches = 2 feet, set up a proportion and solve for x. The answer is 1.25 inches.
Explanation:
To calculate the length of a line on a scale drawing, you must use the scale provided and set up a proportion based on that scale. In this case, the scale is 0.5 inches = 2 feet. To find out what 5 feet would be on the drawing, we can set up a proportion where 0.5 inches/2 feet equals x inches/5 feet. Solving for x gives us:
0.5 inches / 2 feet = x inches / 5 feet
To keep the units consistent, we use cross-multiplication:
(0.5 inches) * 5 feet = 2 feet * x inches
2.5 inches = 2 feet * x inches
Now, divide both sides by 2 feet to solve for x:
x = 2.5 inches / 2 feet
x = 1.25 inches
Therefore, a line that represents an actual length of 5 feet would be 1.25 inches long on the scale drawing.
Find the? mean, median, and mode of the set of values. Age? (years) 11 12 13 14 15 16 17 Frequency 7 9 11 10 9 4 3 Find the mean. Select the correct choice below? and, if? necessary, fill in the answer box to complete your choice. The mean is approximately nothing years. ?(Round to two decimal places as? needed.)
Answers:
Mean = 13.55
Median = 13
Mode = 13
====================================================
Explanations
Mean:
To get the mean, multiply the ages with their corresponding frequencies. Then add up the results. I show this in the attached image below. The highlighted yellow cell is the sum of the x*y column (x = age, y = frequency). This value is 718.
Once you get to 718, you divide this over the total frequency which is 7+9+11+10+9+4+3 = 53 (so there is 53 people).
The mean is therefore 718/53 = 13.5471698113208 which rounds to 13.55
----------------------
Median:
The median is the middle most value. There are 53 values here (add up the frequencies), so the midpoint is at slot 53/2 = 26.5 = 27. The first 26 values are below the median, and the last 26 values are above the median leaving 53-26-26 = 53 - 52 = 1 value in the very exact center.
Add up the frequencies starting from 7 then to 9, etc until you get to 27. So we have
7+9 = 16 which isn't 27
7+9+11 = 16+11 = 27 perfect, we landed on 27
This means that the last copy of 13 is in slot 27. This is because the last frequency added (11) corresponds to the age 13.
That is why the median is 13
----------------------
Mode:
The mode is the most frequent value. Simply record the age that has the highest frequency. In this case, the highest frequency is 11 which corresponds to age 13, pointing to the mode being 13.