x - 7x - 18 Find the limits in a) through c) below for the function f(x) = Use - co and co when appropriate. x - 9 a) Select the correct choice below and fill in any answer boxes in your choice. O A. lim f(x) = (Simplify your answer.) x-9 O B. The limit does not exist and is neither - co nor co.A company manufactures microchips. Use the revenue function R(x) = x(71 - 5x) and the cost function C(x) = 120 + 14x to answer parts (A) through (D), where x is in millions of chips and R(x) and C(x) are in millions dollars. Both functions have domain 1