SOLUTION: if x+y +z+w=15, then at least k of the numbers x,y,z,w must be positive where k is

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Question 444415: if x+y +z+w=15, then at least k of the numbers x,y,z,w must be positive where k is
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
At least one of the numbers must be positive. For example, 18 + (-1) + (-1) + (-1) = 15.