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3 years ago

What is -8 -10 ÷ 2+8=?

Mathematics

1 answer:

jek_recluse [69]3 years ago

4 0

is 3

because like terms

-10/2=-5

-5+8=3

so, 3 is your answer

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If each small cube has a volume of 1 cm,

ella [17]

Answer:

The answer is 40 Centimeters.

Step-by-step explanation:

This answer is correct since there are 4 rows of 10, creating the Rectangular prism. i hope this helped!

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3 years ago

Help me ;)<br><br> 9x-7i >3(3x-7u)

uranmaximum [27]

Answer:

$u>\frac{3x}{7}-\frac{9x-7l}{21}$

Step-by-step explanation:

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2 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

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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

Max can travel 100 miles in 2 hours. At this rate, how many hours will it take him to travel 650 miles?

Tamiku [17]

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650miles in x hrs

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So the distance is 6.5 times

So the time is 6.5 times 2hrs

=13 hrs total

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2 years ago

What the equivalent expression. 5 (3m +2p) - 4m

Ad libitum [116K]

Hi the answer is 11m+10p

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2 years ago