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Firdavs [7]
3 years ago
11

If f(x)=-3x-2, find each value. 1. f(3)

Mathematics
1 answer:
prohojiy [21]3 years ago
5 0

Answer:

-11

Step-by-step explanation:

If F of x is 3, you would implement it into the equation. F(3)= -3(3)-2= -9-2= -11

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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

Therefore, a numerical limits for a D grade would be from 59 to 66 (rounded to nearest whole numbers)

7 0
3 years ago
I need help like really bad
serg [7]

Answer:

A

Step-by-step explanation:

14/15 is less than 7/5

6 0
3 years ago
Read 2 more answers
*7. Mrs. Martin rents a car for $36 plus $0.15 per mile. His budget is $60.
givi [52]

Answer:

The answer is A

Step-by-step explanation:

60-36= 24/0.15=160

5 0
3 years ago
Read 2 more answers
Item 7 Solve the equation. x+12=7
MA_775_DIABLO [31]
7 - 12 = -5 so x = -5
5 0
3 years ago
Read 2 more answers
Three more than twice the number is 25 what is the number
Ymorist [56]

Three more than twice the number is 25

The number you're looking for is 25. Simply work backwards.

25 - 3 (three more...) = 22

22 ÷ 2 (twice the number) = 11

5 0
3 years ago
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