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shusha [124]
3 years ago
5

I don’t understand this

Mathematics
2 answers:
Alexandra [31]3 years ago
5 0

Answer:

-15.41

Step-by-step explanation:

big brain?

BartSMP [9]3 years ago
3 0

Answer:

-13.8

Step-by-step explanation:

6.7ₓ-2.3

Multiply 3 by 7

Multiply 3 by 6

Put a 0 in the ones place

Multiply 2 by 7

Multiply 2 by 6

Add the 2 answers

Add in the negative

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Select The decimal that is equivalent to 7/8
tatuchka [14]

Answer:

0.875

Step-by-step explanation:

look at the fraction as a division problem

8÷7

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3 years ago
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Allisa [31]
2miles=20km
20km/4=5km
5km=0,5mile
Runned 0.5 miles in total
3 0
3 years ago
good morning :) The rental car holds 22 gallons of gas and gets 20 miles per gallon. The trip to Ellis City is 1760 miles. How m
Effectus [21]
1760/ 20 = 88
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6 0
3 years ago
It is known that the population variance equals 484. With a .95 probability, the sample size that needs to be taken if the desir
Ksju [112]

Answer:

We need a sample size of at least 75.

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{1-0.95}{2} = 0.025

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

So it is z with a pvalue of 1-0.025 = 0.975, so z = 1.96

Now, we 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.

The standard deviation is the square root of the variance. So:

\sigma = \sqrt{484} = 22

With a .95 probability, the sample size that needs to be taken if the desired margin of error is 5 or less is

We need a sample size of at least n, in which n is found when M = 5. So

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

5 = 1.96*\frac{22}{\sqrt{n}}

5\sqrt{n} = 43.12

\sqrt{n} = \frac{43.12}{5}

\sqrt{n} = 8.624

(\sqrt{n})^{2} = (8.624)^{2}

n = 74.4

We need a sample size of at least 75.

6 0
3 years ago
Read 2 more answers
Johanna used tiles to build a rectangler array with an array with an areavof 54.list all the possible dimensions of the array
lyudmila [28]
Assuming that all tiles must stay whole it would be:
1×54
2×27
3×18
6×9
4 0
3 years ago
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