exam Maths Puzzle Numerical Ability

How do you detemine the range of the function y=-2x+x when the domain is {1,3,5}

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exam Other Question

reduce to lowest terms

x-y
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xy
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x-y
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xy
Simplify:

square root of 15x^6 * the square root of 16x^5

I got the answer 4x^5 square root of 15x. Is this correct? Thanks so much!!