exam Maths Puzzle Numerical Ability

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)= ?

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exam Other Question

How do you find the equation of a line satisfying the given conditions: perpendicular to x=2 and passing through the point (3,4)? Solve the literal equation for the variable "a".

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