exam Maths Puzzle Numerical Ability

Simplify

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

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exam Other Question

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

I really dont know how to start it! In a bank account, the initial deposit was $2000, the interest rate is 5%, and is calculated quarterly. What is the account balance after 5 years?