Which of the following situations represents a proportional relationship?
The amount Andrew earns mowing lawns for $18 per hour.
O The cost of baseball tickets online at $7 per ticket plus a $3 online processing fee.
The total cost of a taxi that charges $2 per mile plus a passenger fee of $1.50 to pick
O
up a rider
O The height of a 10-inch candle after burning at a rate of 3/4-inch each hour.