# Math

posted by
**Kaleia**
.

Williams Commuter Air Service realizes a monthly revenue represented by the following function, where R(x) is measured in dollars and the price charged per passenger is x dollars.

R(x) = 4800x - 120x2

(a) Find the marginal revenue R'(x).

R'(x) = ??

(b) Compute the following values.

R'(19) = ??

R'(20) = ??

R'(21) = ??

(c) Based on the results of part (b), what price should the airline charge in order to maximize their revenue?

$ ??