And now, what does this tell us? Well, we talked about in the previous video that over the interval that we care about, well, actually, I can show you from this graph. Over the interval that we care about, for t greater than zero, it says that our internal temperature is always going to be greater than 27. And so when you look at this expression here, or when you look at this expression here for dh dt, we talked in the previous video how this is always going to be negative here, because h is always going to be greater than 27, so that part's going to be positive, but then we're gonna multiply it by a negative 1 4th. So our slope, dh dt, our derivative of our temperature with respect to time is always going to be negative. So we could write that this or this, this is going to be negative, let me write it this way, since h is greater than 27, for t is greater than zero, we know that dh dt is negative, is negative. So we could say that this right over here, since dh dt is less than zero, for t is greater than zero, the second derivative of h with respect to t is going to be greater than zero, greater than zero, for t is greater than zero.