Now what does that mean? And you could see it intuitively, if the slope is becoming less and less negative, then that means when we approximated what our temperature is at t equals three, we used a really negative slope, when in reality our slope is getting less and less and less negative. So what we would have done is we would have over-decreased our temperature from t equals zero to t equals three. So that would mean that we would have underestimated it. So let me write that down. And I'm running out of a little bit of space, but let me write it right over here. So that implies, so this implies that underestimate, underestimate, underestimate in part A.