Question

A convenience store sells a coffee mug that comes

with a special price for refills using the mug. The

equation C = 2.3r + 6.5 represents the cost C, in

dollars, of the mug and r refills. What is the cost of

the mug?

Answer 1

The cost of the mug is of $6.50.

Explanation:

The cost of the mug and r refills is given by the following equation:

`C(r) = 2.3r + 6.5`

Cost of the mug:

The cost of the mug is found when no refills are bought, that is, C when
`r = 0`, which is
`C(0)`

`C(0) = 2.3*0 + 6.5 = 6.5`

The cost of the mug is of $6.50.