The value of g^-1(-3) is the value of x that makes g(x) = -3. To find it, we can solve .. (x +4)/(2x -5) = -3 .. x +4 = -3(2x -5) .. 7x = 11 .. x = 11/7
The desired value is .. (3/11)*g^-1(-3) .. = (3/11)*(11/7) .. = 3/7
since he rolled an odd number, he will lose 10 times the number he rolled. he rolled 3, which means he lost 30 points. you get that by multiplying 3 and 10.