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Is x(y+z)>=0?

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Source: — Data Sufficiency |
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by tutorphd » Sat Jul 28, 2012 11:58 pm
1. interpreted means that y and z have the same signs, only then their abs values will add up. Not sufficient because we don't know the sign of x.

2. interpeted means that x and y have the same signs. Not sufficient because we don't know the sign and magnitude of z.

1+2. together mean that x and y and z all have the same sign so x(y+z)>0. Sufficient.
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