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John O'neil

California

I am a retired teacher in the United States of America who loves animals and meeting up with old students

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Top Questions

The sum of the digits of a positive integer $n$ is equal to $100$, is it possible that the sum of the digit of $n^3$ is equal to $100^3$?

summation decimal-expansion asked Jan 14 at 8:03

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Prove concurrent lines in a right angled trapezium

euclidean-geometry circles tangent-line asked Feb 13 at 8:33

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Prove that $F$ is a point such that $PAEF$ is a rectangle then $PF$ bisects $\angle BFC$

euclidean-geometry angle asked Apr 2 at 4:52

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Prove $\frac{a^2}{b^2} + \frac{b^2}{c^2} + \frac{c^2}{a^2} \ge \frac{b}{a} +\frac{c}{b} +\frac{a}{c}$ for all positive reals

algebra-precalculus inequality contest-math cauchy-schwarz-inequality asked Jan 15, 2025 at 0:42

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Find the largest n such that 2013 can be written as the sum of squares of n different positive integers

elementary-number-theory contest-math square-numbers asked Jan 18, 2025 at 0:52

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Prove that a circle centred on a point on a circle bisects the perpendicular line

geometry circles asked Apr 9, 2025 at 2:10

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Top Answers

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