It is i/3 where i is the imaginary number which is the square root of -1.
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-(1/9) and (1/9)
1/9 because 1 divided by nine is 1/9 and the square root of 9 is 3.
The square root of -9/25 is 0.6i or -0.6i, where i is the imaginary square root of -1.
4 square root of -9 = 4 square root of (-1)(9) = 4 square root of (i29) = 4(3i) = 12i
the square root of 9 is 3 so 1 +3 = 4