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anastassius [24]

3 years ago

6

Please please please answer!!!

2 answers:

Llana [10]3 years ago

7 0

that is confusing i have no idea

levacccp [35]3 years ago

4 0

Two angles are complementary if they add up to 90 degrees. The angels of 2x degrees and (30 - 5x) degrees are complementary thus the following equation is 2x + (30 - 5x) = 90

Hope this helps! :)

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What is 88 less than the product 13 times a number x is less than or equal to -32.

Andrew [12]

13x-88 ≤ -32
there's your answer

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3 years ago

Help me please this is very important

uranmaximum [27]

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2 years ago

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If five times of a number is 125 then 0•8 of this number is

Nady [450]

Answer:

20

Step-by-step explanation:

5n = 125

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Anika [276]

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Step-by-step explanation:

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2 years ago

A civil engineer is analyzing the compressive strength of concrete. Compressive strength is normally distributed with σ = 31.62

AysviL [449]

Answer:

A sample size of at least 737 specimens is required.

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:

$\alpha = \frac{1-0.99}{2} = 0.005$

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 $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the width 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.

In this problem, we have that:

$M = 3, \sigma = 31.62$

So:

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

$3 = 2.575*\frac{31.62}{\sqrt{n}}$

$3\sqrt{n} = 81.4215$

$\sqrt{n} = 27.1405$

$n = 736.60$

A sample size of at least 737 specimens is required.

6 0

3 years ago