you are buying gifts for 10 people. you decide to buy each person either a cd or a dvd. a cd costs $12 and a dvd costs $20.
a. let c = the number of cd's you decide to buy. what is an expression in terms of c for the numbers of dvd's you buy?
b. what is an expression in terms of c for the costs of the cd's for the cost of the dvd's?
c. write and simplfy an expression in terms of c for the total costs of all the gifts you buy. what properties of real numbers did you use to simplify the expression?

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