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.
some questions from GR 0568
Re: some questions from GR 0568
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.
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.