We were taught that if we let be the angle sum (the total measure of the interior angles) and be the number of vertices (corners) of a polygon, then . For example, a quadrilateral has vertices, so its angle sum is degrees. Similarly, the angle sum of a hexagon (a polygon with sides) is degrees. […]

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# Monthly Archives: October 2009

## Why do we reverse/flip the inequality sign?

You have probably remembered in Algebra that if we multiply an inequality by a negative number, then the inequality sign should be flipped or reversed. For example, if we want to find the solution of the inequality , we multiply both sides by and reverse the greater than sign giving us . Now, why did the sign […]

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## Problem Set 2

PROBLEMS 1.) Find a linear function such that and . 2.) Solve for : 3.) Prove that the product of consecutive numbers is always divisible by . 4.) Prove that if is prime, and are integers, and , then . SOLUTIONS AND PROOFS Post Date: October 20, 2009 1. Solution: This is just the same as […]

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