Please Help With Math Questions, I keep getting people with wrong answers answering. SO please oh please help me if you know the answers

Danielle has $127.02 in her account before making any transactions. over the course of a week, danielle makes the following transactions: transaction debit ($) credit ($) birthday check 75.00 night out 66.14 garage sale proceeds 121.58 charitable donation 42.25 doctor’s appointment 115.30 at the end of the week, how much money is in danielle’s account? a. $99.91 b. $27.11 c. $184.41 d. $142.16 select the best answer from the choices provided a b c d

What is the value of x in the diagram below?

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=