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.]