Question

The Canada Calendar Company reduces the prices of its calendars each January. The function f(x) = - 25(x-9)^2 + 200 models the company's profits, where x is the price of a calendar in dollars. At what calendar price will the company receive maximum profits?

Answer 1

this math

Answer 2

it is asking for the maximum profits (x), so you want the x-coordinate of the vertex

it's already in vertex form (y = (x-h)^2 + k) so you simply need to find your h value