Question

A music store sells CDs for $12.99 each. Write a rule for the cost of CDs as a function of the number of CDs purchased.

a) Cost = 12.99 * Number of CDs
b) Cost = 12.99 / Number of CDs
c) Cost = 12.99 + Number of CDs
d) Cost = 12.99 - Number of CDs

Answer 1

The cost of CDs as a function of the number of CDs purchased is equal to $12.99 multiplied by the number of CDs.

Step-by-step explanation:

The correct rule for the cost of CDs as a function of the number of CDs purchased is:

Cost = 12.99 * Number of CDs

This means that the cost of CDs is equal to the price per CD ($12.99) multiplied by the number of CDs purchased. For example, if a student buys 3 CDs, the cost would be $38.97 (12.99 * 3).