9. The Nothing-But-Socks specialty store finds that daily Revenue, R(x), in dollars, for selling x pairs of socks is given by R(x) = 25x -0.25, and the cost function for producing each pair of socks is given by C(x) = 2x + 55. Write the profit function, find the vertex and interpret your answer. b) Write P'(x) and find its value when the company produces and sells 46 pairs of socks. Interpret your answer Show all work, or you will lose some credit