book Maths Puzzle Numerical Ability

evaluate eachof the following if a=3 and b=4.
(a-b)4 (3-4)3=-1 =3

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book Other Question

(2x+3)/(9x^2+4x) - (9-6x)/(18x^2-19x-12) Find slope given the following points: (2.5) and (2.1)