exam Maths Puzzle Numerical Ability

I would like any possible help on the following: Find the midpoint of the line segment from A(-2,9) to B(4,5).

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exam Other Question
1) 8-a/b over 40/a

2) 2/5 - y/y-2


3) x/7 - 1/2 = x-11/2

4)x^2+6x-40/x^2-100 What is the domain and graph of this function: f(x)=x^2-4x