17. The marketing research department for a company that manufactures and sells memory chips for microcomputers established the following cost and revenue functions: C(x) = 125 + 16x and R(x) = x(75 - 3x), where x is in millions of chips, and R(x) and C(x) are in millions of dollars. a. Find the value of x that produces the b. What is the maximum profit? maximum profit. 18. The marketing department for a company that produces and sells notebook computers established the following cost and revenue functions: C(x) = 4,000 + 500x and R(x) = x(2,000 - 60x), where x is thousands of computers, and R(x) and C(x) are in thousands of dollars. a. Find the value of x that produces the b. Find the maximum profit. maximum profit