Howard started studying how the number of branches on his tree grows over time.

The relationship between the elapsed time t, in years, since Howard started studying the tree, and the number
of its branches, N(t), is modeled by the following function:

N(t)= 38*(9/5)t/7.3
Complete the following sentence about the rate of change in the number of branches.
years
Howard's tree gains
more branches every