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DochEvi [55]
3 years ago
14

A student says that the algebraic expression 5 x 7 can also be written as 5 7x. is the student correct? explain.

Mathematics
1 answer:
ohaa [14]3 years ago
8 0
Nahhhh
So basically WHERE DID THE x COME FROM anyway ??? 
5 * 7 = 35
but
IT DOES NOT EQUAL TO
57x
It might be true depending on what the x value is, but you dont know what the x value is so ... 
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As a manager for an advertising company, you must plan a campaign designed to increase Twitter usage. A recent survey suggests t
kolbaska11 [484]
Given:
Sample proportion = 85% = 0.85.
Confidence level (CL) = 90%.
Confidence interval (CI) \hat{p} \pm z^{*} \sqrt{ \frac{\hat{p}(1-\hat{p})}{n} }  \\ where \\ n=sample\, size \\ z^{*}=1.645 \, at \, 90\% \, CL

We want the confidence interval to be 5% or 0.05. Therefore
0.85 - 1.645 \sqrt{ \frac{0.85(1-0.85)}{n} }=0.05 \\ 0.85 -  \frac{0.5874}{ \sqrt{n} } =0.05 \\  \frac{0.5874}{ \sqrt{n} }=0.8 \\  \sqrt{n} = .7342 \\ n=0.54

Because this number is less than 1, a default sample size of 30 (for the normal distribution) is recommended.

Answer: 30

3 0
3 years ago
8(x+2) Evaluate when x=3
Burka [1]

When the value of x is 3, evaluate;

8(x+2)

Substitute for the value of x into the parenthesis;

\begin{gathered} 8(x+2)=8(3+2) \\ 8(x+2)=8(5) \\ 8(x+2)=40 \end{gathered}

ANSWER:

The expression equals 40 (when x = 3)

6 0
7 months ago
Subtract. Write your answer as a mixed number in simplest form.<br><br> 8 1/8 - 3 3/8
polet [3.4K]
Therefore, 4 3/4 is your answer

8 0
2 years ago
Read 2 more answers
I need help fast I appreciate the help
Neko [114]

Answer:

3/5

Step-by-step explanation:

Sin is opp/hyp so it would be 30/50 in lowest form it would become 3/5

8 0
2 years ago
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What is the slope of the line in the xy plane that passes through the points (-5/2, 1) and (-1/2, 4)?
zaharov [31]
I hope this helps you

5 0
3 years ago
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