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3 years ago

12

You finish washing 34 of your windows in an hour and a half. At that rate, how much longer will it take you to finish washing al

l the windows? in return i will help u with Physics

1 answer:

Keith_Richards [23]3 years ago

3 0

Answer:

2 hours

Step-by-step explanation:

$\dfrac{\frac{3}{4}}{\frac{3}{2}}=\dfrac{1}{x} \\\\\\\dfrac{1}{2}=\dfrac{1}{x} \\\\\\x=2$

Hope this helps!

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Please I really need help on these two

oksian1 [2.3K]

Answer:

1) 5

2) (3 , 24)

Step-by-step explanation:

Question 1

f(x) x= 1 2 * 5¹ = 10

f(x) x= 2 2 * 5² = 50

f(x) x= 3 2 * 5³ = 250

multiplicative rate of change = 50/10 = 5

check: 250/50 = 5

Question 2

f(x) = 2 * 4ˣ

(3 , 24) f(3) = 2 * 4³ = 2 * 64 = 128 ≠ 24

3 0

3 years ago

True of false an isometry preserves orientation

Alika [10]

True But Mostly Is On Fortnite So It's Very Good

8 0

3 years ago

Read 2 more answers

Hi pls help me!! i'm desperate

gizmo_the_mogwai [7]

Answer:

Six cents per square inch

Step-by-step explanation:

6 0

3 years ago

The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day.

valina [46]

Answer:

A sample of 179 is needed.

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1 - 0.85}{2} = 0.075$

Now, we have to find z in the Ztable as such z has a pvalue of $1 - \alpha$ .

That is z with a pvalue of $1 - 0.075 = 0.925$ , so Z = 1.44.

Now, find the margin of error M as such

$M = z\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

A previous study found that for an average family the variance is 1.69 gallon?

This means that $\sigma = \sqrt{1.69} = 1.3$

If they are using a 85% level of confidence, how large of a sample is required to estimate the mean usage of water?

A sample of n is needed, and n is found for M = 0.14. So

$M = z\frac{\sigma}{\sqrt{n}}$

$0.14 = 1.44\frac{1.3}{\sqrt{n}}$

$0.14\sqrt{n} = 1.44*1.3$

$\sqrt{n} = \frac{1.44*1.3}{0.14}$

$(\sqrt{n})^2 = (\frac{1.44*1.3}{0.14})^2$

$n = 178.8$

Rounding up

A sample of 179 is needed.

7 0

3 years ago

Which of the following sets of ordered pairs satisfies a linear function? a. (-1,5), 2,10), (3,15), (4,18), (5,22) b. (2,4), (4,

finlep [7]

The best answer is B (2,4), (4,6), (6,8), (8,10).

I hope this helps.

7 0

3 years ago