Question

Suppose that the profit, p, for selling bumper stickers is given by p(x) = 0.1x2 + 8x - 50.
What is the minimum number of bumper stickers that must be sold to make a profit?
a.
6
c.
10
b.
2
d.
15

Answer 1

x^2 + 80 x - 500 = 0

x = [ -80 +/- sqrt (6400 + 2000) ] /2

x = [ -80 +/- 91.7 ] / 2
use + result
x = 5.82
so 6

Answer 2

You set up a hot chocolate stand at a football game. The cost of your supplies is $75.You charge $0.50 for each cup of hot chocolate
Write a function that represents the profit P for selling c cups of hot chocolate.