quadratic formula worded question

Question

the weekly profit in a car dealership is given by P= -0.044x²+2.2x-17.5

where P is the profit in thousands of dollars and x is the number of cars sold each week.

ALSO:  a) how much profit is made if 18 cars are sold a week?

b) find the turning point?

c) what is the maximum weekly profit?

Answer 1

###### "x-intersepts" is weer y=0

y=-0.044x^2 +2.2x -17.5

quadratik equashun giv zeroes at x=9.9244328 & 40.0755672

b^2-4ac=40.0755672, sqrt=1.326649916, -b/2a=25

Answer 2

5w^2-3=0