Answer:
Cans for food drive
Step-by-step explanation:
-45 + 150 = 105
Carol has $105 in her account after receiving her paycheck.
John sold 30U
Rick sold 25U
So, Rick sold 5 fewer units than John.
Hope that helps.
I'm assuming this is multiple choice and you forgot to post the answers. I'll take a guess and say it probably looks something like this:

Because you can't take the square root of a negative number without getting an imaginary result, resulting in the function having a closed domain limit.
Answer: 7
Add up the values to get 4+10 = 14
Then divide that result over 2 to get 14/2 = 7
This is using the midpoint formula.