The function for this would be
f(x)= 70x + 5
Plug the 4 and half hours (4.5) into the function
f(x) = (70 x 4.5) + 5
You then get 315 from multiplying 70 and 4.5. Then add the additional 5 from gasoline.
You end up with 320$ for working 4 and a half hours
