adam15 wrote:I think C is the correct answer
1+2
yields e<0, and from 1 we know that e+d=-12 thus e+d<0 then d<-e since e<0 then d>0
any suggestions
if e < 0 and d < -e, d could still be positive or negative.
For example, if e=-5, we get d < -(-5) or d < 5, which could be positive or negative.
Back to the question:
1. e+d=-12
2. e-d<12
Assuming we all agree that they're not sufficient independently, let's jump right to combination.
Combined, we could pick e=-5 and d=-7, since:
-5 + (-7) = -12
and
-5 - (-7) = 2 < 12
Is -7 negative? YES
However, we can also pick e = -15 and d = +3, since:
-15 + 3 = -12
and
-15 - 3 = -12 < 12
Is +3 negative? NO
Since we can get both a YES and a NO answer, we don't have enough information to answer the question: choose E.
