exam Maths Puzzle Numerical Ability

Find the constant of variation k m varies directly with n; m=144 when n=8

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Segmnet MN has midpoint P. If M has coordinates (5, -2)and P has coordinates (4, 2.5), what are the coordinates of N? I need to come up on showing how to answer the square root of 74. It was from a question that started from 5 to the 2nd power + 7 to the second power which I believe is 74 so I nee