exam Maths Puzzle Numerical Ability

I need help finding the Focus of a Parobola. The Vertex is (4,2) and the directrix is y=-3. Also if you are given the Vertex and focus can you find the directix?

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exam Other Question

Write the following equations in the form a+bi

a. i^42 - i^18

b. 1/3-i
suppose you mark 10 points on a line.How many line segments have two of these points as endpoints?