Question

Bob rents a dump truck. The dump truck costs

$85 per day and $0.35 per mile. Which expression
below would help Bob figure out how much (p) the
rental will cost him for a day?

Answer 1

`\text{d) }p=0.35x+85`

Explanation:

Since the 85 dollar fee is fixed, there should be no coefficient or constant that accompanies it. However, the total cost of the miles is directly proportional to the number of miles he drives. Thus, 0.35 should be accompanied by a constant that represents the total number of miles he drove. In this case, that constant is
`x` and
`0.35x` will represent the cost from the number of miles he drives in addition to the 85$ flat fee, hence
`\implies \boxed{\text{d) }p=0.35x+85}`