Question

Greg washes cars on saturday at his dad car dealership. His dad pays him $50 plus $5 for each car that he washes. Greg washes 11 cars last Saturday. use function notation to write an equation that gives the total amount Greg earns as a function of the number of cars he washes. use the equation to find how much he earn last Saturday.

Answer 1

`f(x)=5x+50`

`f(11)=105`

Explanation:

Let x represent number of cars Greg washes and f(x) represent Greg's total income.

We have been that Greg's dad pays him $50 plus $5 for each car that he washes.

The earnings for washing x cars would be
`5x`.

The total earnings for washing x cars would be
`5x+50`.

Therefore, the function
`f(x)=5x+50` represents Greg's total income as a function of the number of cars he washes.

To find the Greg's total income from washing 11 cars, we will substitute
`x=11` in our function.

`f(x)=5x+50`

`f(11)=5(11)+50`

`f(11)=55+50`

`f(11)=105`

Therefore, Greg earned $105 last Saturday.