Find the derivative.y = (x + 9)3e-2x
A. -(x + 9)2(2x + 15) e-3x
B. -(x + 9)2(2x + 15) e-2x
C. -6(x + 9)2e-2x
D. (x + 9)2(x + 12) e-2x
Answer: B
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Decide whether the statement makes sense. Explain your reasoning.If you have $5, then you will buy a hot dog; and, contrapositively, if you don't have $5, then you won't buy a hot dog. (Hint: focus on whether the word "contrapositively" is used correctly.)
What will be an ideal response?
Find the value of df-1/dx at x = f(a).f(x) = 2x2, x ? 0, a = 6
A. 
B. 
C. 24
D. 
Solve the problem.A ladder is resting against a wall. The top of the ladder touches the wall at a height of 12 ft. Find the length of the ladder if the length is 4 ft more than its distance from the wall.
A. 12 ft B. 20 ft C. 24 ft D. 16 ft
Solve the application and answer with a complete sentence.It takes Kathy 30 minutes to type and spell check 14 pages of a manuscript. Find how long it takes her to type and spell check 63 pages.
A. It will take Kathy 135 minutes. B. It will take Kathy 1890 minutes. C. It will take Kathy 30 minutes. D. It will take Kathy 29 minutes.