The Amount of Water an Oak Tree Can Remove from the Ground

The amount of water an oak tree can remove from the ground is related to the tree's size. Suppose that an oak tree transpires where g is the girth in feet of the tree trunk, measured 5 feet above the ground. A tree is currently 5 feet in girth and is gaining 2 inches of girth per year. If t is time measured in years, evaluate

A) 0.432 gallons/day per year
B) 0.995 gallons/day per year
C) 2.312 gallons/day per year
D) 7.586 gallons/day per year
E) 90.027 gallons/day per year