These aren't that hard to identify......
We have the form
a (b)x
When "b" > 0 but < 1.....we have decay
When "b" > 1 ...we have growth
[The "a" doesn't matter ]
So.....in the first part
h(x) = (0.2)x and f(x) = 4(0.3)x are decay functions
And...in the second part
h(x) = (1.9)x and d(x) = 2(4.7)x are growth functions