The graph below represents the rate for the cost of b books. Cost per Book y Cost (dollars) 10 9 8 7+ 6 5 4 3 2 1 X 0 1 2 3 4 5 6 7 8 9 10 Number of Books Write an equation to represent the cost, c.

the surface area is 124cm²

step-by-step explanation:

length: 4cm

width: 9cm

height:   2cm

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).