To form an algebraic expression for the total cost of renting the scooter, we need to consider both the hourly cost of the scooter and the fixed cost for the helmet.
- The cost of renting the scooter is $7.50 for each hour, so for \( x \) hours, the cost for the scooter is \( 7.50x \).
- The cost to rent the helmet is a fixed amount of $3.
Now we can combine these two costs to write the total cost \( C \) as an expression:
\[ C = 7.50x + 3 \]
This expression \( C = 7.50x + 3 \) represents the total cost in terms of the number of hours \( x \) that you rent the scooter.