To write an algebraic expression for the total cost in terms of hours, \( x \), you can break down the costs involved:
- Cost of renting the scooter: This is $7.50 per hour, so for \( x \) hours, the cost would be \( 7.50x \).
- Cost of renting the helmet: This is a flat fee of $3.
Now, combine these two costs to form the total cost \( C \):
\[ C = 7.50x + 3 \]
So, the algebraic expression that describes the total cost in terms of hours \( x \) is:
\[ C = 7.50x + 3 \]