A football team plays in a large stadium. With a ticket price of $19, the average attendance at recent games has been 30 comma 000. A market survey indicates that for each $1 increase in the ticket price, attendance decreases by 200. a. Express the number of spectators at a football game, N, as a function of the ticket price, x. b. Express the revenue from a football game, R, as a function of the ticket price, x.