document.write( "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 \n" ); document.write( "

Algebra.Com's Answer #306357 by richard1234(7193) $\"\"$ $\"About$

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At least one of the numbers must be positive. For example, 18 + (-1) + (-1) + (-1) = 15. \n" ); document.write( "

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