exam Maths Puzzle Numerical Ability

The attached link contains a graph of the polynomial function y = f(x). For which of the values k = 0, 1, 2 or 3 will the equation f(x) = k have complex roots?
http://s227.photobu

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exam Other Question

Please help me solve this question.

Find the equation of each line. Write the equation using function notation.

Through (-4,8); perpendicular to 2x - 3y = 1

Thanks. Find the five-number summary of the following set of numbers.

0.16, 0.08, 0.27, 0.20, 0.22, 0.32, 0.25, 0.18, 0.28, 0.27

HELP can someone please explain this five number thing to me? I do not understand this either. :(