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xxMikexx [17]
3 years ago
10

Where do you place the parentheses in the expression 4+3^2•5-2 to equal 31

Mathematics
1 answer:
Pani-rosa [81]3 years ago
8 0

4+3^2•5-2

4+3^2\cdot(5-2)=4+9\cdot3=4+27=31

Used PEMDAS:

P Parentheses first

E Exponents (ie Powers and Square Roots, etc.)

MD Multiplication and Division (left-to-right)

AS Addition and Subtraction (left-to-right)

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A marketing researcher wants to find a 96% confidence interval for the mean amount those visitors spend per person per day while
ki77a [65]

Answer:

n=(\frac{2.054(12)}{4})^2 =37.97 \approx 38

So then the minimum sample to ensure the condition given is n= 38

Step-by-step explanation:

Notation

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

\sigma=12 represent the population standard deviation

n represent the sample size  

ME = 4 the margin of error desired

Solution to the problem

When we create a confidence interval for the mean the margin of error is given by this formula:

ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}    (a)

And on this case we have that ME =4 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

n=(\frac{z_{\alpha/2} \sigma}{ME})^2   (b)

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What is the solution to 2.1m = 6.3?
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M=3 because you divide 2.1 into 6.3 and i goes in to it 3 times
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Answer:

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=> |4-3| = 1

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=> |4-1| = 3

=> |4-1| = 3

=> |4-3| = 1

<em><u>Now, taking the mean of these absolute deviations:</u></em>

MAD = \frac{1+3+3+2+1}{5}

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GenaCL600 [577]

Answer:

option 1

Step-by-step explanation:

Here (2,0)

(2-4) square -4 is = 0

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