±0.82218*i where i is the imaginary square root of -1.
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Try dividing 179 by all the primes from 2 to 13 inclusive. You will always have a non-zero remainder. And since 17 is greater than the square root of 179, there cannot be any other factors. Therefore, the only factors of 179 are 1 and itself. That is, it is a prime.
1 square mile = 640 acres 179 square miles = 114,560 acres
179/200
179/250