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3 years ago

Simplify. (3x7z2)4 A. 81x11z6 B. 81x28z8 C. 81x3z2 D. 12x28z8

Mathematics

1 answer:

MakcuM [25]3 years ago

3 0

The answer would most likely be D but I'm not entirely sure.

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If sarah works 40 hours a week and earns 660 dollars per payroll. how much does she make an hour

Anika [276]

Answer:16.50

Step-by-step explanation: hope it helps

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2 years ago

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Calculating the degrees of freedom, the sample variance, and the estimated standard error for evaluations using the t statistic

Yuliya22 [10]

Answer:

a) For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

$df = n-1= 10-1=9$

d.9

b) $s^2 = \frac{SS}{n-1}= \frac{600}{41-1}= 15$

a.15

c) For this case we have the sample size n = 25 and the sample variance is $s^2 =400$ , the standard error can founded with this formula:

$SE = \frac{s^2}{\sqrt{n}}= \frac{400}{\sqrt{25}}= 80$

Step-by-step explanation:

Part a

For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

$df = n-1= 10-1=9$

d.9

Part b

From a sample we know that n=41 and SS= 600, where SS represent the sum of quares given by:

$SS = \sum_{i=1}^n (X_i -\bar X)^2$

And the sample variance for this case can be calculated from this formula:

$s^2 = \frac{SS}{n-1}= \frac{600}{41-1}= 15$

a.15

Part c

For this case we have the sample size n = 25 and the sample variance is $s^2 =400$ , the standard error can founded with this formula:

$SE = \frac{s^2}{\sqrt{n}}= \frac{400}{\sqrt{25}}= 80$

8 0

3 years ago

Question is in the Picture. A B C D

oee [108]

B because 2 and 1/3 is 7/3 as an improper fraction times 4 is 28/3 and as a mixed number it is 9 and 1/3

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3 years ago

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(log question, pre-calculus question). question was (2.5) 10 exponent x = 9. 34 . what is x? (99 points)

DedPeter [7]

(2.5)10 ×=9.34
X=2.3
(2.5)10 2.3=9.34

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3 years ago

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I know how to do this but I just want to spend some points :)

Lunna [17]

Answer:

domain: all real numbers

range: y<-2

Step-by-step explanation:

I think its correct but already know the answer sooo yea

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3 years ago