book Maths Puzzle Numerical Ability

Simplify: y to the 4th power times y to the -2nd power. What are the steps you take to solve?

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book Other Question

sqrt(54x^8)
I know the x^8 becomes x^4 but the 54 doesn't have an equal square root 5 years ago, a man was 7 times as old as his son. 5years hence, father will be 3 times as old as his son. Find their present ages.