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Ratling [72]
3 years ago
7

Evaluate the expression when y=5 and x=18 x-3y

Mathematics
2 answers:
Keith_Richards [23]3 years ago
6 0

Answer:

3

Step-by-step explanation:

Step 1: replace y for 5, and x for 18

x-3y

18-3(5)

Step 2: simplify.

18-15

3

dexar [7]3 years ago
4 0

Answer:

Step-by-step explanation:

18 - 3(5)= 18 -15= 3

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Find Atlas weekly pay by multiplying rate by hours:

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An English professor assigns letter grades on a test according to the following scheme. A: Top 15% of scores B: Scores below the
lisabon 2012 [21]

Answer:

59 to 66

Step-by-step explanation:

Mean test scores = u = 74.2

Standard Deviation = \sigma = 9.6

According to the given data, following is the range of grades:

Grade A: 85% to 100%

Grade B: 55% to 85%

Grade C: 19% to 55%

Grade D: 6% to 19%

Grade F: 0% to 6%

So, the grade D will be given to the students from 6% to 19% scores. We can convert these percentages to numerical limits using the z scores. First we need to to identify the corresponding z scores of these limits.

6% to 19% in decimal form would be 0.06 to 0.19. Corresponding z score for  0.06 is -1.56 and that for 0.19 is -0.88 (From the z table)

The formula for z score is:

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

For z = -1.56, we get:

-1.56=\frac{x-74.2}{9.6}\\\\ x = 59

For z = -0.88, we get:

-0.88=\frac{x-74.2}{9.6}\\\\ x = 66

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7 0
3 years ago
- 2(x+5) = -2<br> Directions say solve for the equation
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Answer:

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Add 10 on both sides:

-2x - 10 = -2

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-2x = 8

Divide by -2 on both sides:

-2x = 8

/-2     /-2

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3 years ago
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Which figure best represents a rhombus?
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7 0
3 years ago
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