book Maths Puzzle Numerical Ability

1. Two points, as we know, determine a line segment. To compute the
slope of the line, we can take the points in either order. Explain WHY
this is so. Give an example to help explain.

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book Other Question

I am having trouble with Algebraic Fractions. My question is Reduce the fraction -20 t^5u^2^v^3/48t^7u^4v?????? Is the answer -5t^2v^2/12u^2????? I am confused where I am supose An Indian sand painter begins his picture with a circle of dark sand. He then inscribes a square with a side length of 1 foot inside the circle. What is the area of the circle?

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