7) For a given musical artist, the amount of profit is a quadratic model dependent upon the number of
albums sold. If there are no albums sold, S7000 will be lost, and 40 albums will produce a profit of
S13,000. (15 pts)
a. Write an equation expressing profit in terms of albums. Show your work.
b. Find the "break even" point.
c. How many albums must be sold to reach a profit of $20,000? Show your work.