So divided by, sorry this is from negative one to one, negative one to one, f of x, d of x, divided by our change in x. And our change in x is one minus negative one. So this is going to be equal to one half times the integral, and here f of x is piecewise defined. So what we can do is break up this integral into two intervals. We can say the integral of f of x from negative one to zero of f of x, d x, plus, let me just write it this way so we don't have to keep rewriting the one half. Let me write, I'll use brackets. Plus the integral from zero to one of f of x, f of x, d x.