exam Maths Puzzle Numerical Ability

EVALUATE: a-13 when a =33

2 =3y when y=8

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exam Other Question

14. 12a to the power of 3b to the power of 2, 18a to the power of 2 b to the power of 3, 6a to the power of4 b to the power of4

42. 4s + 6st - 14st2 Divide and Simplify
V^2-4/25v+50 divided by v-2/10
I know that I have to divide by the reciprical but then what??