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Mnenie [13.5K]
3 years ago
8

Jeff uses the expression 2(3b + 1) to determine how many books (b) he needs to order for his store. If b= 12, how many books sho

uld Jeff order?
Mathematics
2 answers:
arlik [135]3 years ago
7 0

Answer:

74 books

Step-by-step explanation:

2(3b+1)

2(3(12)+1

2(36+1)

2(37)

74

pychu [463]3 years ago
5 0

Answer:

D

Step-by-step explanation:

I took the test and If b = 12, then 2(3 * 12 + 1) = 74.

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Hitman42 [59]

Answer:

(a)Food-12%

9b)Transportation-17%

Step-by-step explanation:

In the Year 2000

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  • Amount Spent on Transportation=$7,417

Therefore:

(a)Percentage of the average household income in 2000 was spent on food

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(b)Percentage of the average household income in 2000 was spent on transportation

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3 years ago
The average score of all pro golfers for a particular course has a mean of 70 and a standard deviation of 3.0 (Think of these as
bija089 [108]

Answer:

0.477 is  the probability that the average score of the 36 golfers was between 70 and 71.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 70

Standard Deviation, σ = 3

Sample size, n = 36

Let the average score of all pro golfers follow a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

P(score of the 36 golfers was between 70 and 71)

\text{Standard error of sampling} = \displaystyle\frac{\sigma}{\sqrt{n}} = \frac{3}{\sqrt{36}} = \frac{1}{2}

P(70 \leq x \leq 71) = P(\displaystyle\frac{70 - 70}{\frac{3}{\sqrt{36}}} \leq z \leq \displaystyle\frac{71-70}{\frac{3}{\sqrt{36}}}) = P(0 \leq z \leq 2)\\\\= P(z \leq 2) - P(z \leq 0)\\= 0.977 - 0.500 = 0.477= 47.7\%

P(70 \leq x \leq 71) = 47.7\%

0.477 is  the probability that the average score of the 36 golfers was between 70 and 71.

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yuradex [85]
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2.091 correct to decimal point
kondor19780726 [428]
2.091 rounded to 1 decimal point is 2.1
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shepuryov [24]
It would be C.88-x and there are 36 black keys on an 88 key piano

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3 years ago
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