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¿Question #220843?
pricero1: Which equation do you use most often?

Blazur: 15% of bill = tip.
0Shea0: Polynomial.
rayzg: n choose k
imyourskribe: I use the occasional financial formula. Let’s go with compound interest or something
mr3d: y=(x-x1)*(y2-y1)/(x2-x1)+y1
mattomaw: Pythagoras' right angle triangle one.