IF

f(x)={(3,5), (2,4), (1,7)}

What about 1/f(x)?
would is be {1/5, 1/4, 1/7}?

IF
g(x)=sqrt(x-3)
k(x)=x^2+5

how would I solve?
(k-g)(5)=
(g o k)(7)=
k^-1(x)=
(kg)(x)=

nevermind. I know how to do them.