Question

x// M U C H H E L P N E E D E D //x


3. gabriela is washing cars. she charges $15 for a car wash. she paid $145 for advertising, and uses $3 worth of cleaning products on each car she washes. when will gabriela begin to make a profit?

a) write an inequality to model the problem.
b) solve the inequality. show your work.
c) answer the question from the problem.

Answer 1

she will make a profit after the 12th car.

explanation-    x(15−3)−145>0 to find when she starts to make a profit:

So:

12x−145>0

12x>145

x>14512=12.08≈12  

if x=13:

13⋅12−145=$11