Arain gutter is made from sheets of aluminum that are 18 inches wide by turning up the edges to form right angles. determine the depth of the gutter that
will maximize its cross-sectional area and allow the greatest amount of water to flow.
a. 5 inches
b. 4 inches
c. 4.5 inches
d. 5.5 inches

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.