members of the student council are conducting a fundraiser by selling school calenders. After selling 80 calenders, they had loss 360. After selling 200 calenders, they had a profit of 600 write an equation that describes the relation between y, the profit or loss and x the numbers of calenders sold. how much profit did they make from selling each calender?

the revenue of the fitness center, y, is the product of two factors: the number of members and the fee paid by each member. there are 320 members now, but number of members goes down by 10 for each $5 increase in fees, so if x is the number of $5 price increases then members is equal to (320 - 10x). since the fee is currently $45, and the fee increases by $5 for every price bump x, the fee is given by (45 + 5x). so, revenue y is given by y = (320 - 10x)(45 + 5x).