Find the basis of vectors in R³ spanned by (2, 1, -3) and (4, -1, 5).
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Math question: In circle theorem, if a chord is perpendicular to a radius, what is the relationship between the length of the chord and the distance from the center of the circle to the chord?
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Math question for Problem Solving & Data Analysis:The population of a city increased by 20% in the last decade. If the current population is 500,000, what was the population 10 years ago?