On this problem, we want to figure out the interval on which F of X is continuous and they give us intervals to look at. So when we look at this, if we think about from 5:00 to 6:00, is this continuous on the five to six interval and it's closed. So it wants us to include the endpoints. And the answer would be no, because between 5:00 and 6:00, we have open endpoints. If we look at from six to eight, six to eight, that segment, we would have an open endpoint at six. So that's got to be no. Again, if we look at 7:00 to 8:00, if we look at just 7 to 8, all of those points are solid. So that would be true from 7:00 to 8:00, and then they gave us 6:00 to 8:00. But this time they tricked us a little bit and they gave us a parenthesis on one end, but they gave us the parenthesis on the wrong end. If it had been a parenthesis on the six and A bracket on the 8:00, then that one would have been true. But the bracket on the six isn't true because it's not defined at that point.