But, isn't there something wrong with the sentence? Although many art patrons can readily differentiate a good debenture from an undesirable one, they are far less expert in distinguishing good paintings from poor ones , authentic art from fakes It seems like a run-on sentence. Don't we need a and h...

You are correct @killer1387. Typically "distinguish x from y" is an acceptable idiom. However, in the context of GMAT, OG/GMATPrep defines what is acceptable and what is not. So we should make a note that this idiom is not considered correct per OG. Check out question number 107 in OG11. ...

Another approach: determine the critical points -- the points at which x³(1-x²) = 0. I like your approach too, but how do we determine these critical points and how do we decide which is a better way to solve a question (critical points/algebra)? In my other question: |x-3| = 3-x Are the two crit...

Inequality - Concept

If the equation is |x-3| = 3-x How does this get rephrased to x <= 3 ? I understand to solve the equation we take (x-3), both positive and negative. Right? When (x-3) is positive, x-3= 3-x 2x = 6, therefore x=3 When (x-3) is negative, -x+3=3-x 0=0? So, the question is how the equation become x <= 3 ...

Hi Stuart, I am a little confused about why choice B is wrong. You explanation - "(B) also changes the meaning of the sentence by changing "is roasting" to "roasts". "is roasting" implies that the action is happening right now; "roasts" implies that it's ...

Hi, Can you please provide a bit more info on why D is incorrect? I am still a little confused ... For example, here choice C is correct. In the 1980's the rate of increase of the minority population of the United States was nearly twice as fast as the 1970's. (A) twice as fast as (B) twice as fast ...