Solve the Problem $x$ -Value That Makes Profit a Maximum $$R(x)=58 x-2 x^{2} ; C(x)=24 x+92$$

Multiple Choice

Solve the problem.
-Given the following revenue and cost functions, find the $x$ -value that makes profit a maximum. (Recall that profit equals revenue minus cost.)
$$R(x) =58 x-2 x^{2} ; C(x) =24 x+92$$

A) 9.5
B) 8.5
C) 14.5
D) 17