exam Maths Puzzle Numerical Ability

I need the answers and steps for these five. Even though this is my first question of the day I know it counts as 5 so I will only ask one other today
Thanks
1.(2a5)3
2.(-3xy3)4
3. (5a3b4)2
4.(-mn8)3
5. (-2x2y)3 * (5xy3)2

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exam Other Question

What is the circumference of a circle with a radius of 4.1 m? Round to the nearest tenth.Use pi=3.14





Thanks,
Amanda
What is the fifth root of 96x^10?