exam Maths Puzzle Numerical Ability

can someone please help me with this problem:

What is g(x) = f^-1(x) if f(x) = 1/2x ?

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exam Other Question

factorize-
a-12-(root)5x-30x^
b-6(root)7^+x-5(root)7
c-21+20x^+29(root)2x
d-90x^-7(root)6x-2

plz answer these questions....thankyou!!!
Find the x-intercept and y-intercept for the line with equation 7x-3y=21