book Maths Puzzle Numerical Ability

I get this far and then stuck and not sure if its right.

Simply and write answer in positive exponents only

(x^2)^-3 (x^-2) divided by (x^2)^4

My answer
x^-1 times x^-

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Find two positive numbers in the ratio 2:3 whose product is 2400.
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Find the probability of spinning a number on a spinner that the number with be even or a mulitple of 3. The spinner contains numbers 1 to 8. All sections equally divided.