Answer:
is increasing.
Step-by-step explanation:
I'll try to give you an intuition - although informal, of course. If is a decreasing function, then means to read the graph of "backwards", and thus making it increasing. At that point, is a composition of two increasing function, and is thus increasing.
Now, for a formal answer, let's simply pick two inputs (we will assume that the range of is part of the domain of , otherwise you couldn't compute )
Since is decreasing, we have
But we want to compute , so we have
Since is increasing, we have
and thus
So, we've shown that, given two inputs , the images are in the same order:
This, by definition, means that is an increasing function.