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2 years ago

Please help. Use PEMDAS

Mathematics

2 answers:

german2 years ago

4 0

This order,

P: Parentheses

E: Exponents

M: Multiplication

D: Division

A: Addition

S: Subtraction

Masja [62]2 years ago

3 0

Answer is 5. Add 6 and 4. Subtract 6 from 8. Multiply both answers by 2. Divide 20 by 4

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2 years ago

Nora had already read 30% of the book before her teacher assigned it to the class. She is choosing between two options to finish

guapka [62]

Answer:

Let p represent the # of pages in the book. Then, Nora has already read 0.30p pages and has 0.70p pages left to read.

If she reads 25% pages/night, that means reading 0.25(0.70)p pages per night, or 17.5 pages/night. If 28% p/n, that means 0.28(0.70)p pages/night, or 19.6p pages/night.

How many nights will it take Nora to finish the book if she reads 25% of 7/10 of the book per night? Without any calculations, we can answer this by "4 nights, since she reads 1/4 of the unread portion of the book per night."

If she reads 28% of 7/10 of the book per night, that will require fewer nights:

First night: 28%

Second night: 28%

Third night: 28%

Total: 3(28%) = 84%

This leaves 16% to read on the final night.

This is one interpretation of what I think is a poorly worded question.

The author of this question might have meant reading 25% of the remaining unread pages per night, which leads to a different answer.

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3 years ago

The number of flaws per square yard in a type of carpet material varies with mean 1.4 flaws per square yard and standard deviati

oksian1 [2.3K]

According to the Central Limit Theorem, the distribution of the sample means is approximately normal, with the mean equal to the population mean (1.4 flaws per square yard) and standard deviation given by:
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$z=\frac{1.5-1.4}{0.09}=1.11$
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1 - 0.8665 = 0.1335.

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3 years ago

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fomenos

Answer:

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