Answer:
-20.50?
Step-by-step explanation:
I think you said he added 5 dollars in his account which would get some of his debt removed. But he would still have a remaining -20.50 dollars to get rid of.
For this case we have the following functions:

We must find
. By definition we have to:

So:

Finally, the composite function is:

Answer:

what are do you want from me i don't even know my bad