A text book that I'm reading has $k < -5$ as the solution for $k+5 > 0$. What I want to know is how this can be - why is it not $k > -5$?
Edit: looks like the text book's made a mistake.
To get this question into the answered list:
The textbook made a mistake. Starting from $$k+5>0$$ we can add $-5$ to both sides, producing $$k+5+(-5)>0+(-5).$$ Because $5+(-5)=0$ and $0+(-5)=-5$, we have $$k+0>-5.$$ Finally, because $k+0=k$, we have $$k>-5.$$
Thus, the correct solution is $k>-5$, not $k<-5$.