Part c, find the average value of f on the interval negative one to one. So the average value of a function over an interval is just going to be, so let's just write average. The average value of our function is just going to be the integral over the interval, negative one to one, of f of x, d of x, divided by our change in x. 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.