Part III

Answer all 3 questions in this part. Each correct answer will receive 3 credits. Clearly

indicate the necessary steps, including appropriate formula substitutions, diagrams, graphs,

charts, etc. For all questions in this part, a correct numerical answer with no work shown will

receive only

credit. All answers should be written in pen, except for graphs and drawings,

which should be done in pencil. [9]

A DVD costs twice as much as a music CD. Jack buys 2 DVDs and 2 CDs and spends $45.

Determine how much one CD costs, in dollars. [Only an algebraic solution can receive full credit.]