Find the value of x.
HELP

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

Ten times the square of a non-zero number is eqaul to ninety times the number

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number t of tokens james has is a function of g, the number of games he plays. write the function’s formula? t=