book Maths Puzzle Numerical Ability

Simplify x^2-2x-35/2x^2+10x

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Express in Simpliest Form without negative exponents:
x/x-1 - 2/x^2-1 The volume of a cylinder (think about the volume of a can) is given by V = πr2h where r isthe radius of the cylinder and h is the height of the cylinder. Suppose the volume of the can is 121 cubic centimeters. Write h as a function of r.