What is the answer to this question picture above please answer quickly need help

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

The estimated number of people to attend the last bengals game of the season was 2000. the actual number of fans attending was 1200. by what percent did the estimate differ from the actual?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')