Answer:
f=40
Step-by-step explanation:
f=28, a=7

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Answer:the answer is 27
Step-by-step explanation:
Answer:
b
Step-by-step explanation:
sorry if wrong dont report
a. $150
b. 150+20x
630
20x
480
x
24
c. 150+20x
750
20x
600
x
30
d. 150+20x
950
20x
800
x
40
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Answer:
-21
Step-by-step explanation:
f(-3) = -4(-3)² + 15 = -4(9) + 15 = -36 + 15 = -21