Answer
Exponential growth, rate=1.5
Work Step by Step
You have y=0.15($\frac{3}{2}$$)^{x}$ which is the same as y=0.15(1.5$)^{x}$.This is an exponential growth because b=1.5 is greater than 1 so over time the Y-value increases. The growth factor is 1.5 because it is the value of b.
