Question

Suppose cheese is on sale for $0.75 each, and you have a coupon for $0.50 off your total purchase. Write a function rule for the cost of `x` cheeses.

Answer 1

Let C(x) be the total cost for x cheeses. Each cheese is $0.75, minus $0.50 off the total, so

C(x) = 0.75x − 0.50.

(Here x is a nonnegative integer. If you disallow negative totals, use C(x) = max(0, 0.75x − 0.50).)