inverse functions problem

Question

fill in the blanks

a) If f is one-to-one and f(13)=5, then f ^-1(5)= ____ and (f(13))^-1=____

b) If g is one-to-one and g(-12)=7, then g^-1(7)=____ and (g(-12))^-1=____

Answer 1

a) f^-1(5) = 13, (f(13))^-1 = 1/f(13)=1/5

b) g^-1(7) = -12, (g(-12))^-1 = 1/g(-12)=1/7