exam Maths Puzzle Numerical Ability

The states of Hawaii and Pennsylvania spend a total of $60.9 million for tourism. The state of Hawaii spends $8.1 million less than twice the amount of moeny that the state of Pen

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how do i Simplify by rationalizing the denominator: 5 times square-root of 6 divided by negetive square-root of 3. Can you please help with this one?
(16 - x2)/
(x3 - 2x2 - 8x)
So far I have:
(4-x)(4+x) over
x(x+2)(x-4)
Do this look right and is it as far as I can go?