For example, before that interval, if our function did something like this, then we would have had negative area up to that point, and so these would be negative values. So I would rule that out. For any x value in the interval from seven to 12, the closed interval, the value of g of x is positive. For any x value in the interval from seven to 12, the value of g of x is positive. That is true, so I like this one. Let me see these other ones. F is positive over the closed interval from zero to seven, and it is non-negative over seven to 12.