your answer is a ok i hope this helpful
First off it's D. How you prove it is by doing y = 2x + 5 ( f(x) represents y)
then from there just treat it like an algebraic equation trying to find x.
y = 2x + 5
y - 5 = 2x
y - 5 / 2 = x
f^-1(x)= y - 5 / 2
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