exam Maths Puzzle Numerical Ability

Given that (2-y)^3=8-12y+6y^2-y^3 find (2-y)^4

I really dont know how to start it!

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exam Other Question

Evaluate

C
15 9

Answers to this question would be much obliged..the 15 is supposed to be on left side of the C,sorry. Simplify

y to 0power x to -8power/x -7power z((y 5power)-2power/(z 0power)9power - x to 11power/y to 4 power)