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Ahat [919]
4 years ago
6

Evaluate x3 - 3y when x = -3 and y = 4.

Mathematics
2 answers:
miskamm [114]4 years ago
8 0
I think the answer is
-9-12=-21
Svetllana [295]4 years ago
4 0

Answer:

Step-by-step explanation:

-3^3-3*4

-27-3*4

-27-12

-37

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Vic owns 550 shares of a company.There are 77,000 shares altogether.What fractions of tje company does Vic own?Simplify the answ
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We already have our numerator and denominator. All we need to do now is simplify. 

550/77000

275/3500

Vic owns 275/3500 shares of a company. 

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3 years ago
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6.99

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What is a cofunction? Give examples and explain the purpose.
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3 years ago
Determine the minimum sample size required when you want to be 99% confident that the sample mean is within 0.50 units of the po
vfiekz [6]

Answer:

b. 224

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 = 2.58

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.

In this problem:

We want to find n, when M = 0.5, \sigma = 2.9 So

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

0.5 = 2.58*\frac{2.9}{\sqrt{n}}

0.5\sqrt{n} = 7.482

\sqrt{n} = 14.964

(\sqrt{n})^{2} = (14.964)^{2}

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So the correct answer is:

b. 224

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D.standard deviation

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