I don’t know how to do this is 10th grade Geometry

Frank owns a $141,000 home, for which he has a 30-year mortgage in the amount of $700 a month. once he has paid off mortgage, how much will he have paid in investment? a. $111,000 b. $109,000 c. $120,000 d. $141,000

If g^-1(x) is the inverse of g (x) which statement must be true

What is fraction that is equivalent to 3/8