book Maths Puzzle Numerical Ability

I DONT GET THE INVERSE WITH EXPONENTS WITH THEM LIKE FOR EXAMPLE:
f(x)=2x^3 or f(x)=x^2-2x

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book Other Question

using the formula h= -16t + 20 +300
supose you are standing on top of a 300ft tall building, right next to the edge and you throw a ball straight up in the air.
How long before Graph a piecewise function in the form of y=mx+b rise/run
f(x)= 4-x if x<2
1+2x if x> or = 2