Brendon makes and sells greeting cards. He charges $5.00 for 2 cards, $7.50 for three cards, $12.50 for 5 cards, and $20.00 for 8 cards. Which equation shows the relationship between the number of cards, n, and the total cost, c?
a. c= 2/5 n b. c=0.4n c. c=2.5n d c=2.5 + 5
Think of it like this, 5.00/2=2.50 ok then 7.50/3=2.50 then 12.50/5=2.50 then 20.00/8=2.50 so the answer is c=2.50n.
Just divide the amount of money by the amount of cards, and that should get you your answer. c=2.50n because it is 2.50 (c) for ever greeting card (n)