exam Maths Puzzle Numerical Ability

Solve the literal equation for the variable "a".

x=(a+b+c)/(ab)

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exam Other Question

Help I do not understand this at all! Thanks so much for any help given.
It says find the function value f(x)=x3
f(-2)= ? Find the area of a regular octagon with an apothem 13.3 feet long and each side 11 feet long