Please solve the problems step-by-step.

11) Find C(x) if C'(x) = x and C(9) = 40.

A) C(x) = 2x^3/2 + 22 B) C(x) = 2/3x^3/2 + 22 C) C(x) = 2x^3/2 + 31 D) C(x) =2/3x^3/2 + 31

12) A company has found that its expenditure rate per day (in hundreds of dollars) on a certain type of

job is given by E'(x) = 8x + 3, where x is the number of days since the start of the job. Find the

expenditure if the job takes 8 days.

A) $6700 B) $28,000 C) $67 D) $280