So let's say that this is time t equals three right over here. We want to approximate the temperature that this model describes right over here, but we're gonna do it using the line. So we're gonna evaluate the line at t equals three. So then we would get, let's see, negative 16 times three plus 91 is equal to, this is negative 48 plus 91 is equal to, what is that, 43. So this is equal to 43 degrees Celsius. So this right over here is the equation for the line tangent to the graph of h at t is equal to zero. And this right over here is our approximation using that equation of the tangent line of the internal temperature of the potato at time t is equal to three.