Question 1007613
An agency is promoting concert tickets by offering a group-discount rate. The regular price is $120 and for each ticket bought the price decreases by $1. (One ticket costs $119, two tickets costs $118 each, and so on.) 
Write a formula. 
f(x)=___________ (type an expression using x as the variable.) 
Use f(x) to determine symbolically the number of tickets that should be sold to maximize revenue. 
_____ tickets should be sold 
Use f(x) to determine symbolically the maximum revenue.
The maximum revenue i

let x=number of tickets sold 
 Revenue=x(120-x)=-(x^2-120x
complete the square:
-(x^2-120x+3600)+3600
(x-60)^2+3600
This is a parabola with vertex at (60,3600)
maximum revenue of 3600 occurs when the number of tickets sold=60