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levacccp [35]
3 years ago
11

Need help on number one and three

Mathematics
1 answer:
Naya [18.7K]3 years ago
4 0

An example for #1 would be that: 15 is divisible by 3, but not 9. every third multiple of 3, (9, 18, 27,...) is divisible by 9 because 9 is three times the size of 3.

For part two the first number that I thought of is 23.

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I need to solve for 3x+7=-x-1
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3x+7=-x-1

move -x to the other side

sign changes from -x to +x

3x+x+7=-x+x-1

3x+x+7=-1

4x+7=-1

move 7 to the other side

sign changes from +7 to -7

4x+7-7=-1-7

4x=-8

Divide by 4 for both sides

4x/4=-8/4

Answer: x=-2

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Move the numbers to the blanks to order them from least to greatest value.
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6 0
2 years ago
John's commute time to work during the week follows the normal probability distribution with a mean time of 26.7 minutes and a s
STatiana [176]

Answer:

0.32493

Step-by-step explanation:

We have been given that John's commute time to work during the week follows the normal probability distribution with a mean time of 26.7 minutes and a standard deviation of 5.1 minutes.

We are asked to find the probability that the commute time for a randomly selected day will be between 28 and 34 minutes.

First of all, we will find z-score corresponding to 28 minutes and 34 minutes. Then, we will find area under normal curve between both z-scores.

z=\frac{x-\mu}{\sigma}

z=\frac{28-26.7}{5.1}=\frac{1.3}{5.1}=0.25

z=\frac{34-26.7}{5.1}=\frac{7.3}{5.1}=1.43

Now, we need to find the probability between z-score of 1.43 and 0.25.

P(0.25.

Using formula P(a, we will get:

P(0.25

P(0.25

P(0.25

Therefore, the probability, that the commute time for a randomly selected day will be between 28 and 34 minutes, is 0.32493.

6 0
3 years ago
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