Answer:
The answer is c.
Step-by-step explanation:
I took the quiz
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I find it best to switch everything exponents when taking derivatives.
F(x) = 7/x
Same as..
F(x) = 7x^-1
Take derivative..
F'(x) = -7x^-2
Plug in x = 1
F'(1) = -7(1)^-2
F'(1) = -7
X=5 because 4x5=20 and 20-4=16