Sam wrote all the integers from 250 to 500 in a row. Margaret replaced each of these numbers with the sum of its digits. Sam replaced each of Margaret's numbers with the sum of its digits. This continued until only one-digit natural numbers remained. At the end, which one-digit natural number is written the least number of times?

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

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the first one, all those points on the line just make a strait line.