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RideAnS [48]
2 years ago
6

Simplify √ 63 fully, giving your answer in the form a √ b

Mathematics
2 answers:
Misha Larkins [42]2 years ago
8 0

A12

Step-by-step explanation

worty [1.4K]2 years ago
5 0

Answer:

3\sqrt{7}

Step-by-step explanation:

Using the rule of radicals

\sqrt{a} × \sqrt{b} = \sqrt{ab} , then

\sqrt{63}

= \sqrt{9(7)}

= \sqrt{9} × \sqrt{7}

= 3\sqrt{7}

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Answer:

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Step-by-step explanation:

The first thing is to calculate critical z factor

the alpha and the critical z score for a confidence level of 90% is calculated as follows:

two sided alpha = (100% - 90%) / 200 = 0.05

critical z factor for two sided alpha of .05 is calculated as follows:

critical z factor = z factor for (1 - .05) = z factor for (.95) which through the attached graph becomes:

critical z factor = 2.58

Now we have the following formula:

ME = z * (sd / sqrt (N) ^ (1/2))

where ME is the margin of error and is equal to 6, sd is the standard deviation which is 14 and the value of z is 2.58

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solving for N we have:

N = (2.58 * 14/6) ^ 2

N = 36.24

Which means that the sample size was 37.

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3 years ago
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Orlov [11]

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