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Alona [7]
3 years ago
9

Maria has a box of 20 cookies. She gives 2 cookies to each friend. Which expression shows the number of cookies Maria has left a

fter giving cookies to m friends?
A. 2m - 20
B. 20 - 2m
C. 20m - 2
D. 20 + 2m
Mathematics
2 answers:
eimsori [14]3 years ago
8 0
B. 20-2m would be the correct equation!
Anvisha [2.4K]3 years ago
5 0
B is the correct answer
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You can decide where to put the first digit because you know 153 doesn't fit into 6 or 61. But you know it can fit into 613. You put it there.

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Consider the expression 40+24 . Find the greatest common factor of the two numbers and use the distributive property to rewrite
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Hi there!

\large\boxed{8(5+3)}}

The greatest common factor of 40 and 24 is 8.

8 goes into 40 5 times:

8 goes into 24 3 times.

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Suppose that you are an elementary school teacher and you are evaluating the reading levels of your students. You find an indivi
aleksklad [387]

Answer:

The child's reading level is at the 3.4th percentile.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

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You do some research and determine that the reading rates for their grade level are normally distributed with a mean of 90 words per minute and a standard deviation of 24 words per minute.

This means that \mu = 90, \sigma = 24

You find an individual that reads 46.4 word per minute. At what percentile is the child's reading level?

The percentile is the p-value of Z when X = 46.4, multiplied by 100. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{46.4 - 90}{24}

Z = -1.82

Z = -1.82 has a p-value of 0.034.

0.034*100 = 3.4

The child's reading level is at the 3.4th percentile.

6 0
3 years ago
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