exam Maths Puzzle Numerical Ability

the question states:
if f(x)=-3x+12, find f(1/3).

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exam Other Question

I need this worked out so I can understand on how to do it. Page 87
The problem is 12% of what is 48? Simplify the following expressions.

(x^7)^3

a)x^10 b)x^21 c)3x^21 d)3x^7