Hello,

I've been studying for my test and got stuck on this question, can anybody explain it to me?

The demand function for a new product is P(x) = -5x + 22 where x is the number of items sold in thousands and p is the rice in dollars. The cost function is

C(x) = 3x + 15.

a) state the corresponding revenue function (I'm pretty sure it's -5x^2 + 22x)

b) Find the corresponding profit function(I'm having problem with that)

c) Complete the square to find the value that will maximize the profits.

d) Find the break even quantities.

Thank you,