exam Maths Puzzle Numerical Ability

What is the inverse of the function y=logbase2 x????
Is it:
a)y=2^-x
b)y=2^x
c)y=x^2 or
d)y=logbase2 2 ????

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exam Other Question

How do you write 3x = y + 4 in y = mx + b term sqrt3 sqrt3
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sqrt9x^2 = x + 6

I am having a hard time figuring these out. Can you help?(sqrt means square root)