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3 years ago

5

The table shows information about the numbers of hours 30 children spent on their tablets one evening.A) Find the class interval

that contains the median.B)Work out an estimate for the mean number of hours

1 answer:

Tresset [83]3 years ago

8 0

Answer:

A- 2<h<3 B- 2.2

Step-by-step explanation:

when you make a dot plot, the median is 11. using that dot plot, you can approximate a mean to be around 2

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The total length of wires a b and c is 445 cm wire a is 45 cm longer then wire b and wire b is half as long as wire c how long i

Oksana_A [137]

Answer:

$a = 145\ cm$

Step-by-step explanation:

Given

$a + b + c = 445$

$a = 45 + b$

$b = \frac{1}{2}c$

Required

Determine the length of a

Solve for c in $b = \frac{1}{2}c$

$2 * b = \frac{1}{2}c * 2$

$2b = c$

$c = 2b$

Substitute $c = 2b$ and $a = 45 + b$ in $a + b + c = 445$

$a + b + c = 445$

$45 + b + b + 2b = 445$

$45 + 4b = 445$

Solve for 4b

$4b = 445 - 45$

$4b = 400$

Solve for b

$b = 400/4$

$b = 100$

Recall that: $a = 45 + b$

$a=45+100$

$a = 145\ cm$

6 0

3 years ago

) Kim made $157.50<br> for 7 hours of<br> babysitting. What is<br> her hourly pay?

goldenfox [79]

Answer:

$22.50 I believe...

Step-by-step explanation:

157.50 divided by 7

??

7 0

2 years ago

Read 2 more answers

Assume that x and y are both differentiable functions of t and find the required values of dy/dt and dx/dt.

Mariulka [41]

This problem requires the use of the chain rule: dy / dt = [dy / dx] * [dx / dt]

y = √x => dy / dx = 1 / (2√x)

<span>(a) Find dy/dt, given x = 16 and dx/dt = 7.

dy/dt = [ 1/(2√x) ] * 7 = [1/(2*4)] * 7 = 7/8

(b) Find dx/dt, given x = 64 and dy/dt = 8.

dx/dt = [dy/dt] / [dy/dx] = 8 / [1/(2√64) ] = 128
</span>

6 0

2 years ago

Read 2 more answers

What is the slope of the line <br>y=5+4x<br>1)5<br>2)9<br>3)1<br>4)4

kifflom [539]

Correct Answer to this question is 4

6 0

3 years ago

Which function below is the inverse of f(x)= 7x-1/2

Keith_Richards [23]

Answer: $f^{-1}(x)=\frac{x}{7}+\frac{1}{14}$

Step-by-step explanation:

If we have y=7x-1/2, the inverse is where we solve for x instead of y.

We can isolate x to get 7x=y+1/2, then divide by 7 to get x=y/7+1/14.

Therefore, $f^{-1}(x)=\frac{x}{7}+\frac{1}{14}$ .

Hope that helped,

-sirswagger21

8 0

3 years ago