exam Maths Puzzle Numerical Ability

suppose you mark 10 points on a line.How many line segments have two of these points as endpoints?

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exam Other Question

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? how would this be solved :

1)Find the area of a rectangle if three of its corners are (-0.1,-3.4), (-7.9,-3.4), and (-0.1,6.8).