The price of oranges went from $.90 per lb to $1.20 per lb in five years. find the rate of change of the price of oranges.
a) $0.30 per pound per year
b) $0.06 per pound per year
c) $0.24 per pound per year
d) $0.18 per pound per year

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.