A set of quiz scores is shown in the histogram below. The mean of the data set is 20.2, and the (population) standard deviation is 2.4.



PLEASE PLEASE PLEASE How many numbers in the data set are within 1 standard deviation of the mean?

13
14
15
16

Answer:

We have the following equations:

5 + 3x - 2 and x + 2(x+1) + 1

Before checking the statements. Let's solve the syste of equations:

5 + 3x - 2 = x + 2(x+1) + 1

5 + 3x - 2 = x + 2x+2 + 1

3x + 3 = 3x + 3

Both equations are equivalent. Now, let's judge the statements:

1. The expressions are only equivalent when evaluated with odd values.

Given that the both expression are the same, the expressions are equivalent for ALL values.

Therefore, the statement IS FALSE ❌

2. The expressions are only equivalent for x=3 and x=7.

Given that the both expression are the same, the expressions are equivalent for ALL values, not only x=3 and x=7.

Therefore, the statement IS FALSE ❌

3. The expressions should have been evaluated with one odd value and one even value.

If two expressions are equivalent, they should be equivalent for ALL values. Sometimes, evaluating just one odd and one even value isn't enough. That's why the best approach is to solve the system of equations.

Therefore, the statement IS FALSE ❌

4. The expressions have equivalent values when x=6.

Given that the both expression are the same, the expressions are equivalent for x=6 (And all the real values too).

Therefore, the statement IS TRUE ✅

5. When x=0, the first expression has a value of 3 and the second expression has a value of 4.

Given that BOTH expressions are equvalent, they have the same value when x=0, which is 3.

Therefore, the statement IS FALSE ❌

6. The expressions have equivalent values for any value of x.

Given that the both expression are the same, the expressions are equivalent for ALL values of x.

Therefore, the statement IS TRUE ✅

7. When x=10, both expressions have a value of 33

Given that the both expression are the same, the expressions are equivalent for ALL values of x. That's why when x=0, both expressions have a value of 33.

Therefore, the statement IS TRUE ✅

Answer:

D,F,G

Step-by-step explanation:

It Makes Sense.

The equation would be h = 25 + m

^^^The reason this is the equation is because the amount of time it takes to do the homework is the 25 min of reading AND the m of completing math problems

Insert 20 in for m and solve for h

h = 20 + 25

h = 45

Insert 25 in for m and solve for h

h = 25 + 25

h = 50

Hope this helped!

~Just a girl in love with Shawn Mendes

The answer is:

To graph a piecewise function, we need to graph each of the function that compounds the principal function (piecewise function) for the given values of the domain.

So,

For the first function, we have:

[tex]f(x)=y=3x-5\\\\y=3x-5[/tex]

We have that it's a positive slope line with y-intercept at -5, so, calculating the x-intercept we have by making y equal to 0, we have:

[tex]y=3x-5[/tex]

[tex]0=3x-5[/tex]

[tex]x=\frac{5}{3}=1.67[/tex]

Also, we have the domain for the function:

[tex]y=3x-5\leq -1[/tex]

Which domain is coming from the negative infinite to -1:

Domain: (-∞, -1]

Hence, we have that the function has a positive slope, intercepts the y-axis at (0,-5) and the x-axis at (1.67,0), also, it exists from -∞ to -1.

- For the second function, we have:

[tex]f(x)=y=-2x+3\\\\y=-2x+3[/tex]

We have that it's a negative slope line with y-intercept at 3, so, calculating the x-intercept we have by making y equal to 0, we have:

[tex]y=-2x+3[/tex]

[tex]0=-2x+3[/tex]

[tex]x=\frac{3}{2}[/tex]

Also, we have the domain for the function:

[tex]-2x+3, -1<x<4[/tex]

Which domain is coming from the negative infinite to -1:

Domain: (-1,4)

Hence, we have that the function has a negative slope, intercepts the y-axis at (0,3) and the x-axis at (1.5,0), also, it exists from (-1 to 4)

- For the third function, we have:

[tex]y=2[/tex]

We have that it's a horizontal line, existing from 4.

The domain for the function will be:

[tex]2,x\geq 4[/tex]

or:

Domain: [4,∞)

- Graphing:

First function: Green line

Second function:  Black line

Third function: Red line

Note: I have attached two pictures for better understanding, in the first picture we can see the functions that compound the piecewise function without the domain conditions, in the second picture we can see the functions with the domain conditions given by the piecewise function.

Have a nice day!

Answer

914 m^2 to the nearest whole number.

Step-by-step explanation:

The area of the hexagonal base is made up of 6 congruent triangles so its area = 6* 1/2 base* height

= 6 * 1/2 * 12 * 6√3

= 216-√3 m^2.

The area of each slanting triangle = 6 * 15 m^2 so the lateral area of the pyramid

= 6*6*15= 540 m^2

Total surface area = 540 + 216√3

= 914.12 m^2.

hope this helps

and to make it simpler its C or 914.12

Answer:

Cross Multiply.

Step-by-step explanation:

Multiply the denominator (3) of one side and the numerator (n).

Then, multiply the numerator (2) of on side and the denominator (4) of the other.

3n = 8

You divide both sides by 3 to have n be by itself, equaling ~2.6 or 8/3.

Answer:

Let's solve your system of equations by elimination.

8x+9y=48;12x+5y=21

Steps:

Multiply the first equation by 5,and multiply the second equation by -9.

5(8x+9y=48)

−9(12x+5y=21)

Becomes:

40x+45y=240

−108x−45y=−189

Add these equations to eliminate y:

−68x=51

Then solve−68x=51for x:

−68x /−68 = 51 /−68  (Divide both sides by -68)

x=  −3 /4

Now that we've found x let's plug it back in to solve for y.

Write down an original equation:

8x+9y=48

Substitute

−3 /4

8x+9y=48:

8( −3 /4 )+9y=48

9y−6=48 (Simplify both sides of the equation)

9y−6+6=48+6 (Add 6 to both sides)

9y=54

9y /9  =  54 /9  (Divide both sides by 9)   y=6

Answer:  x=  −3 /4  and y=6

Hope This Helps!  Have A Nice Day!!

where are the expressions ?

Answer:

3x + 2

Step-by-step explanation:

Answer:

The value of the single logarithm is -11 ⇒ answer B

Step-by-step explanation:

* Lets revise the rule of the logarithmic functions

# ㏒ a + ㏒ b = ㏒ ab  

# ㏒ a - ㏒ b = ㏒ a/b

# ㏒ a^n = n ㏒ a  

# ㏒ 1 = 0  

* Now lets solve the problem

∵ [tex]log_{b}(\frac{A^{5}C^{2}}{D^{6}})[/tex]

- Change the single logarithm to an expression by change the

  multiplication to addition and the division to subtraction

∵ [tex]log_{b}A^{5}=5log_{b}A[/tex]

∵ [tex]log_{b}C^{2}=2log_{b}C[/tex]

∵ [tex]log_{b}D^{6}=6log_{b}D[/tex]

∴ The single logarithm = [tex]5log_{b}A+2log_{b}C-6log_{b}D[/tex]

* Now lets substitute the values

∵ [tex]log_{b}A=3;===log_{b}C=2;===log_{b}D=5[/tex]

- Substitute the values into the expression

∴ The value = 5(3) + 2(2) - 6(5) = 15 + 4 - 30 = -11

* The value of the single logarithm is -11

:) Hope this helps you to your question

3.142×40^2×150=753,982.237

if1sec =0.2litres

what about 753.982=

753.982×1/0.2

=22.80

To determine if filling a tank takes longer than an hour, calculate the tank's volume, convert it to liters, and then divide by the fill rate. With a 240π liter capacity and a 0.2 L/s fill rate, it takes approximately 1.05 hours, thus longer than 1 hour.

To determine if it takes longer than 1 hour to fill a water tank with a radius of 40 cm and depth of 150 cm at a rate of 0.2 liters per second, we first calculate the volume of the tank and then the total time required to fill it at the given rate.

Step 1: Calculate the Volume of the Tank

Volume of a cylinder = πr²h, where r is the radius and h is the height.
Here, r = 40 cm and h = 150 cm.

Volume = π(40²)(150) = π(1600)(150) = 240000π cm³.

Step 2: Convert the Volume to Liters

Since 1 liter = 1000 cm³, the volume in liters = 240000π / 1000 = 240π liters.

Step 3: Calculate the Filling Time

Time = volume / rate = 240π / 0.2 = 1200π seconds.
To convert to hours, divide by 3600 (the number of seconds in an hour).

Total time in hours = 1200π / 3600 = π/3 hours, which is approximately 1.05 hours.

Since it takes approximately 1.05 hours to fill the tank, it does take longer than 1 hour to fill the tank.

Answer:

8:16 p.m.

Step-by-step explanation:

You have to find LCM(a,b), where a=48 seconds and b=95 seconds (2 minutes 15 seconds).

1.

[tex]48=2\cdot 24=2\cdot 2\cdot 12=2\cdot 2\cdot 2\cdot 6=2\cdot 2\cdot 2\cdot 2\cdot 3=2^4\cdot 3.[/tex]

2.

[tex]95=5\cdot 19.[/tex]

3.

[tex]LCM(48,95)=2^4\cdot 3\cdot 5\cdot 19=4560\text{ seconds }=76\text{ minutes }=1\text{ hour }16 \text{ minutes. }[/tex]

If they rang together at 7 p.m, then the next time that the timers will ring together will be after 1 hour 16 minutes that is 8:16 p.m.

Answer:

8:16 p.m.

Step-by-step explanation:

You have to find LCM(a,b), where a=48 seconds and b=95 seconds (2 minutes 15 seconds).

1.

2.

3.

If they rang together at 7 p.m, then the next time that the timers will ring together will be after 1 hour 16 minutes that is 8:16 p.m.

Answer:

12 feet

Step-by-step explanation:

The length of the ladder is 13 ft

The base of the ladder is 5 ft away from the wall

The height(h) the ladder reaches from the bottom of the wall is:

Applying the Pythagorean theorem;

h = [tex]\sqrt{13^2 - 5^2}[/tex] = 12 ft

Answer: x = 1/6 or 1.6667

3x * 2 + 6x = 2

Multiply the numbers: 3 * 2 = 6

6x + 6x = 2

Add similar elements: 6x + 6x = 12x

12x = 2

Divide both sides by 12

12x / 12  =  2 / 12

Simplify

x = 1/6

Answer:  The required discriminant of the given quadratic equation is 60.

Step-by-step explanation:  We are given to find the discriminant of the following quadratic equation :

[tex]3x^2+6x=2\\\\\Rightarrow 3x^2+6x-2=0~~~~~~~~~~~~~~~~~~~~~~~~~(i)[/tex]

We know that

the discriminant of a quadratic equation [tex]ax^2+bx+c=0,~a\neq 0[/tex] is given by

[tex]D=b^2-4ac.[/tex]

For the given equation (i), we have

a = 3,  b = 6  and  c = -2.

Therefore, the discriminant of the given equation will be

[tex]D=b^2-4ac=6^2-4\times3\times(-2)=36+24=60.[/tex]

Thus, the required discriminant of the given quadratic equation is 60.

Answer:

-13

Step-by-step explanation:

a^2 + 3ab - b^2?

Plug in a=3 and b= -2

a^2 + 3ab - b^2

=  (3)^2 + 3(3)(-2) - (-2)^2

= 9 - 18 - 4

= -13

Value of expression [tex]a^{2} +3ab-b^{2}[/tex] is -13.

An expression is a number, a variable, or a combination of numbers and variables and operation symbols.

Given

[tex]a =3 \ and \ b= -2[/tex]

Value of expression [tex]a^{2} +3ab-b^{2}[/tex]

= [tex]3^{2} +3 \times 3 \times (-2 )- (-2)^{2}[/tex]

= [tex]9-18-4[/tex]

= [tex]-13[/tex]

Value of expression [tex]a^{2} +3ab-b^{2}[/tex] is -13.

Find out more information about expression here

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Answer:

height is 5 units

Step-by-step explanation:

We are required to determine the height of a triangle that has an area of 30 square units and a base measuring 12 units.

The formula for the area of a triangle is given as;

[tex]Area=\frac{1}{2}*base*height[/tex]

We plug in the given values and solve for the height;

[tex]30=\frac{1}{2}*12*height\\\\30=6*height\\height=5[/tex]

Answer:

5 units^2

Step-by-step explanation:

Answer:

Triangle

Step-by-step explanation:

Look at the shape of the red part

The shape of the triangle is the cross-section part of the given figure. Thus, option A is correct.

The cross-section part of the given figure could be the shape fro the inscribed figure.

Here we can see that the three-dimensional figure inscribed in the square is a cone.

The right circular cone is the cone in which the line joining peak of the cone to the center of the base of the circle is perpendicular to the surface of its base.

But for the plane of the square, the triangle is the cross-section part of the given figure.

Learn more about shape here;

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[tex]\bf h=\cfrac{1}{5}w+\cfrac{8}{5}\implies \stackrel{\textit{multiplying both sides by }\stackrel{LCD}{5}}{5(h)=5\left( \cfrac{1}{5}w+\cfrac{8}{5} \right)}\implies 5h=w+8\implies 5h-8=w[/tex]

The equation that can be used to find the number of weeks since planting is (b) w = 5h - 8

The equation is given as:

h = (1/5)w + (8/5)

Multiply through by 5

5h = w + 8

Subtract 8 from both sides

5h - 8 = w

Make w the subject

w = 5h - 8

Hence, the equation that can be used to find the number of weeks since planting is (b) w = 5h - 8

Read more about subject of formula at:

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Answer:

The discount is 15% because 6/40 = 0.15 and a percent is multiplied by 100 so the answer is 15%.

To find the percentage discount, subtract the discount amount from the original price and divide by the original price, then multiply by 100.

To find the percentage discount, we need to calculate the amount of the discount first. The discount is given as $6, so we subtract $6 from the original price of $40 to get $34. To find the percentage, we divide the discount amount by the original price and multiply by 100. In this case, the discount percentage would be (6/40) * 100 = 15%.

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Alternate interior angles I believe

Answer:

x=-4 and x=2

Step-by-step explanation:

You are given the function

[tex]f(x)=\dfrac{x^2+2x-8}{x^2-2x-8}[/tex]

The zeros of the function are those value of x, for which [tex]f(x)=0[/tex]

First, find x for which function is undefined

[tex]x^2-2x-8\neq0\\ \\x^2-4x+2x-8\neq 0\\ \\x(x-4)+2(x-4)\neq 0\\ \\(x-4)(x+2)\neq 0\\ \\x\neq 4\text{ and }x\neq -2[/tex]

Now find points at which f(x)=0:

[tex]f(x)=0\Rightarrow x^2+2x-8=0\\ \\x^2+4x-2x-8=0\\ \\x(x+4)-2(x+4)=0\\ \\(x-2)(x+4)=0\\ \\x=2\text{ or }x=-4[/tex]

For both these values (x=-4 and x=2) function f(x) is defined, then x=-4 and x=2 are zeros of the function.

Final answer:

To find the zeros of the given function, set the numerator equal to zero and solve for x. The zeros are x = -4 and x = 2.

Explanation:

We can notice that both the numerator and denominator share the same factors (x² - 2x - 8). This means that f(x) is undefined where the denominator is zero.

Therefore, the zeros of the function f(x) = x² + 2x - 8 / x² - 2x - 8 can be found by setting the numerator equal to zero and solving for x.

By factoring the numerator and denominator, it becomes easier to identify the zeros.

x² - 2x - 8 = 0

Factoring the expression:

(x - 4)(x + 2) = 0

Therefore, the zeros of the function f(x) are x = 4 and x = -2.

Answer: Apple Juice

Step-by-step explanation: Right of the bat we know 40 out of 80 is 50%. This is already less then the 68% we are given, so therefore it can't be mango jelly. 0.475 would be made into a percent of 47.5%. We know that the fraction would be 475 over 1000, so we need to move the decimal point once to the left for each number, giving us the percent above. 68% is greater than 47.5, making Apple juice the winned

Apple juice good luck

Part a: decaying;

Part b: decays 11% each year( 100-89=11);

Part c:the initial value of the scooter ( money spent to buy the scooter)

The value of Mikayla's scooter, modeled by the exponential decay function f(x)=13500x0.89^x, is decaying at a rate of 11% per year. The initial cost of the scooter was $13,500.

The function f(x)=13500×0.89^x is an example of an exponential decay function because the base (0.89) is less than 1. So, the value of Mikayla's scooter is decaying.

Part a: The value of the scooter is decaying because the base of the exponential function is less than 1.

Part b: The rate of decay is 11% per year. This comes from the fact that 1 - 0.89 = 0.11 or 11%, signifying the percentage decrease each year.

Part c: 13500 represents the initial value of the scooter. This is how much the scooter was worth when it was first purchased by Mikayla.

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The width of the rectangle is 4 cm, found by dividing the area of the square (36 cm^2) by the length of the rectangle (9 cm).

To solve the problem we need to first understand two main concepts; the area of a square and the area of a rectangle. The area of a square can be found by squaring the length of one of its sides, which can be described with the formula A = a^2 where a is the side length of the square. Since the perimeter of the square is 24 cm, each side is 24 cm / 4 = 6 cm. Therefore, the area of the square is 6 cm * 6 cm = 36 cm^2.

The area of a rectangle is calculated by the formula A = length * width. We are given that the length is 9 cm and that the area of the rectangle is equal to that of the square, which we found to be 36 cm^2. To find the width, we divide the area by the length: 36 cm^2 / 9 cm = 4 cm. Thus, the width of the rectangle is 4 cm.

Answer:yes

Step-by-step explanation:

2+7=9

12+2=14

12+7=19

Answer:

No

Step-by-step explanation:

the sum of two sides has to be greater than the third side

2+7=9 9 isn't greater than 12

Answer:

Supplementary Angles are two angles the sum of whose measures is 180º. Supplementary angles can be placed so they form a linear pair (straight line), or they may be two separate angles.

Answer:

b) ∠4 and ∠3

c) ∠4 and ∠5

e) ∠3 and ∠6

Answer:

The answer is $0.69. This is because there are 32 ounces in the bottle, and $22.08/32=0.69, or $0.69.

Step-by-step explanation:

nearest cent so so 32.86 but since its money and 32.86 times 7 is 230.02 it should be rounded down so the answer will be 32.85

Answer:

A and C

Step-by-step explanation:

This question is on probability.

In the first option A, when a coin is tossed, two outcomes are obtained, a head or a tail. Angel to mop can be represented by heads and Isaiah to mow can be represented by tail.In this case, a 50% chance is observed.

In the third option, putting each person's name on a separate piece of paper in a bag has two outcomes to be obtained. The probability of picking a person name is 50%. You can pick a paper with Angel's name or Isaiah's name.The picked name will mow the lawn.

In the second option B, when a coin is flipped twice, we obtain 4 outcomes; HH,HT,TH,TT. If either toss is tail, TT, then Angel mows the lawn.However, there are 3 other outcomes that could occur which will make Isaiah to mow the lawn.In this case it will be unfair because the probability for Angle to mow, P(A)=1/4 where as that for Isaiah to mow P(I)=3/4

In the last option D, the probability of rolling a cube with a number 1 or 6 is 1/6. This is the same for geting a 2,3,4,or 5.Angel will mow if the number is 1 or 6 where as  Isaiah will mow if the number is 2,3,4 or 5. This is unfair to Isaiah because geting any number holds a probability of 1/6, while Angels waits for 2 numbers, he waits for 4 numbers.

Answer: Option 1 and 3

Step-by-step explanation:

A fair decision is when both of them have the same probability of winning and losing, in this case, because we have two possible results, we need to find an experiment with a 50/50 chance.

The coin in option 1 is a good option, 50% of the time it will end in tails and 50% of the time it will come up with heads, so this will be a fair decision.

option 3 also works, because we have two pieces of paper, if you draw one, the probability of drawing a specific one is 1/2 (the specific result divide by the total number of possible results) and this is equivalent to 0.5 or 50%.

The other two options have probabilities that are not equal, for example in the fourth option, Angel mows the lawn when the number is 1 or 6, we have 2 out of 6 results where he mows the lawn, this is p = 2/6 = 1/3

then the probability of Isaiah of mowing the lawn is p = 4/6 = 2/3, wich is bigger.

Mode could work but I believe the best answer would be median.

Answer:

median

Step-by-step explanation:

Median is correct. One extreme outlier can "drag" the mean up or down, while it would have little or no effect on the median.

Answer:

(2, 5)

Step-by-step explanation:

Given the 2 equations

y = x + 3 → (1)

- 2x + y = 1 → (2)

Substitute y = x + 3 into (2)

- 2x + x + 3 = 1

- x + 3 = 1 ( subtract 3 from both sides )

- x = - 2 ( multiply both sides by - 1 )

x = 2

Substitute x = 2 into (1) for corresponding value of y

y = 2 + 3 = 5

Solution is (2, 5)

Answer: y=5, x=2

Step-by-step explanation: