Maria is renting kayaks from a local shop that charges a $10 fee, plus an hourly rate of $7.50. For how long can Maria rent the kayak if she pays a total of $70?

In this case, Maria is rent a kayaks that charge a $10 upfront fee, with an hourly rate of $7.50. Then the equation of the price should look like this: f (x) = 10+7.5x

If Maria has a total money of 70$, then the duration of rent should be:

f (x) = 10+7.5x

70 = 10 + 7.5x

7.5x = 70-10

x = 60/7.5 = 8 hours