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Aleks04 [339]
2 years ago
5

What is the expression after applying the distributive property? −3.1(−9+(−7))

Mathematics
1 answer:
s344n2d4d5 [400]2 years ago
7 0
-31 because if you do p.e.m.d .a .s
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Which pair of angles are vertical angles?
Leokris [45]

Answer:

C and D

Step-by-step explanation:

They are both right

4 0
2 years ago
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14 kg of apples cost $154.how much would 16kg cost
ankoles [38]
We can set up a proportion, and let x be the amount 16kg would cost: 14/154=16/x. We simplify 14/154 = 1/11. Next, we cross-multiply to get (1)(x)=(16)(11), so x=176. Therefore, 16kg of apples cost $176.
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4 0
2 years ago
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Brewed decaffeinated coffee contains some caffeine. We want to estimate the amount of caffeine in 8 ounce cups of decaf coffee a
rusak2 [61]

Answer:

We would have to take a sample of 62 to achieve this result.

Step-by-step explanation:

Confidence level of 95%.

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 - 0.95}{2} = 0.025

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 - 0.025 = 0.975, so Z = 1.96.

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.

Assume that the standard deviation in the amount of caffeine in 8 ounces of decaf coffee is known to be 2 mg.

This means that \sigma = 2

If we wanted to estimate the true mean amount of caffeine in 8 ounce cups of decaf coffee to within /- 0.5 mg, how large a sample would we have to take to achieve this result?

We would need a sample of n.

n is found when M = 0.5. So

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

0.5 = 1.96\frac{2}{\sqrt{n}}

0.5\sqrt{n} = 2*1.96

Dividing both sides by 0.5

\sqrt{n} = 4*1.96

(\sqrt{n})^2 = (4*1.96)^2

n = 61.5

Rounding up

We would have to take a sample of 62 to achieve this result.

8 0
3 years ago
How can 8 ounces be expressed in pounds
vichka [17]

The answer would be .5 pounds

1 ounce is equal to .0625 lbs

so 8 * .0625 = .5

hope this helps :)

brainliest???

4 0
3 years ago
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4 ft<br> 3 ft!<br> 4 ft<br> 7 ft<br> Area:
Sergio [31]

Answer:336ft

Step-by-step explanation:

multiply

7 0
3 years ago
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