28% of 60= i need help now i am in middle school

What is a possible solutions of the x> 3?

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

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50.