book Maths Puzzle Numerical Ability

I need to find the coordinates of the point C, halway between the points A(5,1) and B9-2,7)

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book Other Question

While vacationing in the orient, Sonia spends $200 purchasing ornate chess sets for her figt shop in California. A week later she finds the same chess set selling for $5 less per p 1. How do you add two intergers if they have the same sign?

2. How does the absolute value of a number in assigning a sign on the sum or difference of intergers?

3.How do you