Answer:

He made $70 in 5 hours
Explanation:
Given

Required
Determine a function to represent the amount he made
Determine the amount made in 5 hours
To determine the function (D), we simply multiply the hourly rate by the number of hours worked (h).
So, we have:



Represent D as a function

Solving (b): Amount in 5 hours
We have that

In this case:

So, we have:


Hence, he made $70 in 5 hours