book Maths Puzzle Numerical Ability

Please help me answer this questions..
2)what is the midpoint of a segment?

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book Other Question

Identify the shape of the graph, transform it into standard form, and sketch the graph.
25x^2 + 4y^2 - 300x - 24y + 836 = 0 This proble involves a function rule..
Input X 1 2 3 4 5 6
Output Y 3 2 1 0 -1 -2
We need to determine the function rule.

Another one..
Input X 1 2 3 4 5 6
Input y 1 3 5 7 9 11

Thanks!