Answer: 
Step-by-step explanation:
To find the function h(x), you need to subtract the function
and the function
.

Distribute the negative sign:

Now you can add the like terms:

Therefore, you get that the function h(x) is:

Your current balance is -50
You write a check for 20$
You will now have -50 - 20 = $-70
Hope that helps :)