some questions from GR 0568

Forum for the GRE subject test in mathematics.
sandraizbasa
Posts: 8
Joined: Tue Jul 14, 2009 5:24 am

some questions from GR 0568

Postby sandraizbasa » Thu Nov 05, 2009 12:47 pm

These are what I am not sure:

14 22 28 31 36 38 39 46 49 52 54 55 60 61 62 65


Any replies will be greatly appreciated.If some of them have been answered before, just skip them.

yoyobarn
Posts: 80
Joined: Sun Dec 19, 2010 7:01 am

Re: some questions from GR 0568

Postby yoyobarn » Tue Jan 17, 2012 12:57 am

For Q31,
we can note that y'=1+y^4>0, and y''=4y^3\cdot y'. Hence, the graph should be increasing everywhere, and concave when y<0, and convex when y>0.

I think the above is enough to pick option (A).

Furthermore, at y=0, y'=1, and (A) also fits that.




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