If the second derivative is continually increasing over the interval [-2,1] on h(x), what does that tell us about the first derivative, h'(x)? Thanks!
Consider the function: $h(x)=-e^{-x}$. See its plot here.
Please note that $h(x)=h''(x)$, hence the second derivative is increasing on $[-2,1]$ but what about $h'(x)=e^{-x}~?$.