exam Maths Puzzle Numerical Ability

I need some help checking this question. Thanks.

Simplify: y(to the power of 60) + y(to the power of 45) / y(to the power of 15)

Answer: y(to the power of 30)(y(to the power

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I need help with the following

Set K contains 30 elements, set J contains 46 elements, and 11 elements are common to both sets. Find n ( K U J). Determine which two equations represent perpendicular lines.

A y= 4/7x-3 B y= 3x-4/7 C y=-1/3x+4/7 D y= 1/3x-4/7

Please instruct me on how to do this