So g prime of x is decreasing, or we can say that our second derivative, our second derivative is less than zero. It's less than zero. And once again, I could draw it on this. So when x is lower, we have a, look, we have a, or it looks like we have a positive slope, then it becomes less positive, and then it becomes less positive, it's approaching zero, it becomes zero, then it becomes negative, and then even more negative, and then even more negative. So as you see, our slope is constantly decreasing as x increases here. So in order to think about the intervals where g is either concave upward or concave downward, what we need to do is let's find the second derivative of g, and then let's think about the points at which the second, over the second, where the second derivative can go from being, from going, from being positive to negative or negative to positive, and those will be places where it's either undefined or where the second derivative is equal to zero. And then let's see what's happening in the interval between, and then we'll know.