Algebra 2 question , (picture) more than one answer is right

G(x) = 20(1.5)^x
Using the graph we can figure out that:
f(x) = 15(2)^x

So does f(x) have a faster rate of change than g(x) on the interval (-5,-3).  I used the rate of change formula, and saw that it does NOT.

f(x) and g(x) are always positive, so the second one is not true.

f(x) and g(x) are always increasing, so the third one is TRUE.

g(x) intercept is 20 and f(x) intercept is 15, so the fourth one is TRUE.

So the answer is C and D.

It would be 18 cm