We use Q for Rationals... which is repreentative of Quocentia (Quotient), since rationals are RATIOs or fractions.
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x and y are complementary so x + y = 90 and so y = 90 - x z and q are complementary so z + q = 90 and so q = 90 - z x = z so 90 - x = 90 - z that is y = q
100 zeroes in a googal... the 'q' is a typo for a 'g'
It comes from the German word zahlen.
q
Z is the set of all integers {... -3, -2, -1, 0, 1, 2, 3, ...}