The opposite of -15 is 15 .
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30 is the answer. 5th opposite to 20th, so 20-5=15. Hence 15 childrens in one half, and another 15 in the other half.
cot(x) = 15/12 X = cot -1(15/12) In degree mode. X = 46o ======
It depends on whether the "15" is a vector or a scalar. If it is a scalar then it indicates 15 steps in any direction. Only if it is a vector is the direction specified and then, 15 is the same number of steps in the opposite direction.
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