exam Maths Puzzle Numerical Ability

I need some help with these problems I am having problems

Factor completely x^3-x^2-20x

and also

solve: 3/x-1=6/x+2

Thank you

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exam Other Question

how many gallons of water can be stored in a cylindrical tank 35 feet high and 12 ft. in diameter? round to the nearest whole number An isosceles trapezoid must have two pairs of equal adjacent angles. State and prove the converse.

I know what the converse is, but i dont know how to prove it.