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RadiumBall
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C, Both statements together are sufficient.
Stmt 1:
e + d = -12
e = -13, d =1 works
So does, e = -11 and d = -1.
Not sufficient.
Stmt 2:
e - d < -12
e = 1, d = 14 works
e = -15, d = -1 works.
Combined.
Substitute for e in the inequality from the given equation.
e + d = -12 ==> e = -d -12
-d - 12 -d < -12. can be solved to get d's sign.
