exam Maths Puzzle Numerical Ability

Please help me to simplify the following :

(a^2bc^-1)^-2(ab^0c)^2
DIVIDED BY
(3a^2)^-3

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exam Other Question

explain the difference between (-3)^2 and -3^2 For the exponential function e^x and logarithmic function log x, graphically show the effect if x is doubled.