book Maths Puzzle Numerical Ability

how do you divide (x-3) by (x^2-4)???

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Could someone help me with this?
A right triangle has legs of lengths 7m and 9m. Which is the best estimate of the length of the hypotenuse? 10m,,11m,12m,13m Hey i would really really really appreciate some help, test tomorrow!
(e^t - e^-t )/ 3 =2