Which is negative 36. And so once again on this interval you are concave, concave downward. Now let's, I graphed this ahead of time. Let's see if what we just established is actually consistent with what the graph actually looks like. We were able to come up with these insights about the concavity without graphing it. But now it's kind of satisfying to take a look at a graph. And actually let me see if I can match up the intervals.