Question

Solve. Show all your work and explain your steps.
You are buying gifts for 10 people. You decide either to buy either a CD or a DVD. A CD costs $12 and a DVD costs $20.
a) Let c = the number of CDs you decide to buy. What is an expression in terms of c for the number of DVDs you buy?
b) What is an expression in terms of c for the cost of the CDs? For the cost of the DVDs?
c) 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?

Answer 1

Dont get this confuses me

Answer 2

no help? :/