exam Maths Puzzle Numerical Ability

please help me with the following :

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2^-3*a^-3/c(2a^3c - 8a^3/c^2)

thank you!

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exam Other Question

the product of the slopes of two of the slopes of nonvertical perpendicular lines is
A.0
B.1
C.-1
D.2
E.not enough info I really need help:
In 5 years Chim will be three times as old as Jared. The sum of their ages is 42. How old are Chim and Jared.