Question

f(x) = {(7,3), (5,3), (9,8).(11,4)}g(x) = {(5, 7),(3,5), (7,9), (9,11)}a) f-1(x)b) g-1(x)

Answer 1

To get the inverse, simply invert every pair of points:

$f^{-1}(x)=\mleft\lbrace(3,7\mright),(3,5),(8,9),(4,11)\}$$g^{-1}(x)=\mleft\lbrace(7,5\mright),(5,3),(9,7),(11,9)\}$