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Lena [83]
3 years ago
15

HELP SOMEONE PLEASE ANSWER the math question​

Mathematics
1 answer:
Anettt [7]3 years ago
3 0

Answer:

4, 2, 1, 3

Step-by-step explanation:

2/3(x + 21 - 1) - 162

We used the formula for PEDMAS

Step 1

2/3(x + 20) - 162

Step 2

2/3(x + 20) = 162

Multiply both sides by 3/2

Step 3

3/2× 2/3(x + 20) = 162 × 3/2

x + 20 = 81 × 3

x + 20 = 243

Subtract 20 from both sides

x + 20 - 20 = 243 - 20

Step 4

x = 223

Therefore, according to the above calculation, the correct steps to solve this question is 4, 2, 1, 3

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0.75

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A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained i
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Answer:

sample size if he uses a previous estimate of 32​% is 523

sample size if he does not use any prior​ estimates is 601

Step-by-step explanation:

estimate E = 4 percentage = 0.04

confidence Cl = 95% = 0.95

previous estimate p = 32% = 0.32

q = 1 - 0.32 = 0.68

to find out

size of sample

solution

first we calculate z value for 95% confidence E = 0.04 is 1.96

from probability P(-1.96 < z < 1.96) = 0.95)

here z = 1.96

so in 1st part size of sample we know

E = z × \sqrt{pq/n}

put all value E, z p and q and we get n

n = (z/E)² ×p×q

n = (1.96/0.04)² ×0.32×0.68

n = 523

sample size if he uses a previous estimate of 32​% is 523

now in 2nd part we take p = 0.5

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n = (z/E)² ×p×q

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n = 601

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Is 60n + 12 equal to 12(5n + 1)
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Answer:

Multiply vector c by the scalar -1/2.

Step-by-step explanation:

Look at vector c.

It has an x component of 4 and a y component of 4.

You can write vector c as a sum of its components using unit vectors in the x direction (i) and in the y direction (j).

c = 4i + 4j

Now look at vector d, and write it also as a sum of its x and y components.

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Now ask yourself, what operation do I do to 4 to end up with -2?

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