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Mathematics 15 Online
OpenStudy (anonymous):

3. Solve. Show all of your work and explain your steps. 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. Write and simplify an expression in terms of c for the total cost of all the gifts you buy. What properties of real numbers did you use to simplify the expression?

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