Question

Barbara buys a box of pens for $4. For every additional box she buys, she gets a $1 discount. Which expression represents the total cost of the pens, c, as a function of the number of boxes, b?

c = f(b) = 4b – 1
c = f(b) = 4b + 1
c = f(b) = 3b + 4
c = f(b) = 4b + 3
c = f(b) = 4 + 3(b – 1)

Answer 1

@dan815

Answer 2

@SolomonZelman