If W's slope decreases, it could still stay positive. And the way I drew it doesn't, let me draw it like this, just to make it clear. So let's say that, let's say we find out that the slope looks something like this. This is the slope of the tangent line at time equals 0. If W's slope increases from that point, then W might look something like that. And then, our answer to part A would be an understatement, would be an underestimate of where W actually is after a fourth of a year. Let me make it clear to you what I'm doing.