All right. Now they say, match each expression with its given value. So what is the base of the triangle at time t sub zero? Do they give that to us? Well, let's see. They say at a certain time, at a certain instant, t sub zero, the base, I'm gonna underline this in a different color, the base at a certain instant, t sub zero, the base is five meters. So they say the base at time t sub zero, the base is a function of time, but they tell us that it is five meters.