book Maths Puzzle Numerical Ability

Find the midpoint of the line segment from A(2-,9) to B(4,5).

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book Other Question

Is there a specific formula to figuring out M2? For example: i have bedsheets and in my system is asking me to provide m2 How do I figure that out having only this number available (1/4-1/x^2)/(1/2+1/x) can someone help me simplify this complex fraction?