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Verizon [17]
3 years ago
10

Simplify the following expression [ (3x6) ] + (5x2) ] ÷ 7

Mathematics
2 answers:
KonstantinChe [14]3 years ago
6 0
<span>[ (3x6) ] + (5x2) ] ÷ 7
= (18 + 10)/7
= 28/7
= 4</span>
STALIN [3.7K]3 years ago
3 0
The correct answer to this problem is 4
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sergij07 [2.7K]

Answer:

7x+3y

Step-by-step explanation:

Hope this helps :)

7 0
2 years ago
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The population standard deviation for the typing speeds for secretaries is 4 words per minute. If we want to be 90% confident th
Oksana_A [137]

Answer:

The minimum sample size that should be taken is 62.

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{1-0.9}{2} = 0.05

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 1-0.05 = 0.95, so z = 1.645

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.

If we want to be 90% confident that the sample mean is within 1 word per minute of the true population mean, what is the minimum sample size that should be taken

This is n when M = 1, \sigma = 4. So

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

1 = 1.96*\frac{4}{\sqrt{n}}

\sqrt{n} = 4*1.96

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

n = 61.5

The minimum sample size that should be taken is 62.

8 0
3 years ago
kevin has $26 wants to rent bicycle.The bicycle rents for $6.25per hour. How many hours can kevin ride without owing more money
Fudgin [204]

Answer:

I got 4 hours and 16 minutes

Step-by-step explanation:

I divided the amount of money he has ($26) to the amount it takes to rent for one hour ($6.25). To make it more simple you could just say 4 hours worth of rent.

3 0
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8 0
2 years ago
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MArishka [77]

Answer:

it would be 21

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hope i helped :)

7 0
3 years ago
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