Which of the following situations represents a proportional relationship? a. A cheeseburger is $7.95 plus $1.00 for each additional topping.
b. A pool fills at a rate of 90 gallons per hour.
c. A health club charges a $40.00 membership fee plus $25.00 per month.
d. A bank account begins with $350.00 and gains $30.00 per month

The height of a birch tree, f(x), in inches, after x months is shown in the graph below. how much does the birch tree grow per month, and what will be the height of the birch tree after 10 months? a. the birch tree grows 1 inch per month. the height of the birch tree will be 16 inches after 10 months. b. the birch tree grows 2 inches per month. the height of the birch tree will be 26 inches after 10 months. c. the birch tree grows 3 inches per month. the height of the birch tree will be 36 inches after 10 months. d. the birch tree grows 2 inches per month. the height of the birch tree will be 24 inches after 10 months.