Question

A manufacturer determines that the number of drills it can sell is given by this formula,
D = -3p2 + 180p - 285, where p is the price of the drills in dollars.

A. At what price will the manufacturer sell the maximum number of drills?

B. What is the maximum number of drills that can be sold?

A) a. $60 b. 285 drills

B) a. $30 b. 2415 drills

C) a. $31 b. 2418 drills

D) a. $90 b. 8385 drills

Answer 1

I refrase the questions for you, :)
A. find the x coordinate of the vertex of a parabola y = -3x2 + 180x - 285
B. find the y coordinate of the vertex of a parabola y = -3x2 + 180x - 285