book Maths Puzzle Numerical Ability

Find the midpoint of the line segment PQ for P(4, -3), Q(2,7)

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book Other Question

y=2x-3/2 Sarah is visiting a friend about two miles away from her house. She sees a hot-air balloon directly above her house. Sara estimates that the angle of elevation formed by the hot-air balloon is about fifteen degrees. About how high is the hot-air balloon?