Thor had a balance of -4$ in his savings account . after making a deposit , he has 25$ in his account . what is the overall change to his account ?

The equation to solve this would be:
-4+x=25
Solve for x.
Add 4 to both sides.
(-4+x)+4=(25)+4
x=29

The overall change to account was $29.

Hope this helps.
-Benjamin

He put $29 in to make -4 a positive $25.