exam Maths Puzzle Numerical Ability

this is a question on my reviewsheet! help!

1
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a+ 2
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b

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exam Other Question

Let w (omega) be a root of the equation x^2 + x + 1 = 0. Define a complex valued function f by f(n) = (w^2n)/(1 + w^n).

What is f(1)+ f(2) + f(3) + ... + f(20)?
Solve the inequality. Graph the solution set, and write it in interval notation.

-3x is less than or equal to -9