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2 years ago

What is 528−−√+63−−√528+63 in simplest radical form?

Mathematics

2 answers:

Montano1993 [528]2 years ago

6 0

Answer: $13\sqrt{7}$

Step-by-step explanation:

In the simple radical form there are no square root is remain to find.

Since, the given expression,

$5\sqrt{28} + \sqrt{63}$

$5\sqrt{4\times 7} + \sqrt{9\times 7}$

$5\sqrt{4} \times \sqrt{7} + \sqrt{9}\times \sqrt{7}$

$5\times 2 \times \sqrt{7} + 3\times \sqrt{7}$

$10 \sqrt{7} + 3\sqrt{7}$

$(10 + 3)\sqrt{7}$

$13\sqrt{7}$

Since, we do not need to find further square root of 7.

Thus, the required radical form of $5\sqrt{28} + \sqrt{63}$ is $13\sqrt{7}$ .

Rufina [12.5K]2 years ago

3 0

Answer:

$13\sqrt{7}$

Step-by-step explanation:

$5\sqrt{28} +\sqrt{63}$

To simplify the given expression we simplify each radical

$5\sqrt{28} = 5\sqrt{4*7} = 5*2\sqrt{7} =10\sqrt{7}$

$\sqrt{63} = \sqrt{9*7} =3\sqrt{7}$

$5\sqrt{28} +\sqrt{63}$

$10\sqrt{7}+3\sqrt{7}$

$13\sqrt{7}$

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Answer:

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The 90% confidence interval for the proportion would be then

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where $\bf z^*$ is the 10% critical value for the Normal N(0,1) distribution , this is a value such that the area under the N(0,1) curve outside the interval $\bf [-z^*,z^*]$ is 10%=0.1

We can either use a table, a calculator or a spreadsheet to get this value.

In Excel or OpenOffice Calc we use the function

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This means there is a 90% probability that the proportion of people who watch educational television is between 72.10% and 81.89%

If the television company wanted to publicize the proportion of viewers, do you think it should use the 90% confidence interval?

Yes, I do.

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