If a and c are real numbers such that 0<a<c, which of the following must be true?

A) -a<-c
B) 2a sqrt c
D) a^2 > c^2
2) a/c > 1

Wait–what happened to the answer choices? A, B, D, 2?

Comments (2)

B must be true–if you multiply both sides of the original inequality by 2, that’s what you get. Other choices MIGHT be true for some values of a and c, but will also be false for other values of a and c.

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