4. On a beach trip, Lucy rents a bike from "Wheels by the Waves", where

they rent bikes for $12 plus $3 per hour. If Lucy spent $30, how many hours

(h) did she rent a bike?

6 hours

Step-by-step explanation:

The equation for this would be

c=3h+12

It costs $3 per hour, and there is a $12 cost no matter how many hours the bike is rented for

We know, c, or the cost is $30, so we can substitute that in

30=3h+12

Solve, by isolating the variable, h

First, subtract 12 on both sides

30=3h+12

18=3h

Divide by 3 on both sides

h=6

So, she rented the bike for 6 hours