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4 years ago

15-7times2plus2to the power of 3

Mathematics

1 answer:

Afina-wow [57]4 years ago

7 0

Answers:

15 - 7 x 2 + $2^{3}$

$(11-8)^{2}$ - 2 x 6

39 - $5^{2}$

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What is the LCM of 16a 3 b and 24ab 2?

vitfil [10]

Do the operation:

3, 16, 24 | 2

3, 8, 12 | 2

3, 4, 6 | 2

3, 2, 3 | 2

3, 1, 3 | 3

1, 1

Answer:

$\boxed{\bf~The~answer~is~2^{4}~*~3~or~48.}$

Hope it helped,

Happy homework/ study/ exam!

6 0

4 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

4 years ago

PLZZZZZ HELPPPPP!!!!!!!!!!

Alja [10]

Answer:

Step-by-step explanation:

150/360=5/12 so the sector is 5/12 the area of the whole circle which is 81π. 5/12(81π) =405/12 or 135/4. Answer A

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3 years ago

HELP ME ASAP PLEASE!!! FAST

Bogdan [553]

I believe it is six. Don't quote me on that though

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4 years ago

Vanessa earns a base salary of $400.00 dollar every week with an additional %5 percent commission on everything she sells. Vanes

GalinKa [24]

5% is $82.5. So total pay last week is 482.5.

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4 years ago