Mary has g+24.50 in her bank account. bobby has 7g- 52.34 in his bank account. how much do they have in all?

Combine:

g+24.50  

7g- 52.34 

8g - 27.84             <= answer

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.