David O.

Amateur mathematician, unfortunately with non-mathematical day job (addendum: but luckily now retired!).


152,298 students helped
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Level 6 in Algebra Level 4 in Calculus Level 4 in Precalculus Level 3 in Trigonometry Level 2 in Statistics Level 2 in Physics Level 1 in Prealgebra Level 1 in Socratic Meta