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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

 Jan 12, 2017
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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) 

 Jan 13, 2017

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