Cassidy is renting a bicycle on the boardwalk. The rental costs a flat fee of $10 plus an additional

Cassidy is renting a bicycle on the boardwalk. The rental costs a flat fee of $10 plus an additional $7 per hour. Cassidy paid $45 to rent a bicycle.

We set up the cost equation C(h) where h is the number of hours of rental:
C(h) = hourly rental rate * h + Flat Fee
C(h) = 7h + 10

We're told that Cassidy paid 45 to rent a bicycle, so we set C(h) = 45
7h + 10 = 45

To solve for h, we type this equation into our math engine and we get:
h = 5