In the given table we note that there are six clear subintervals: [0, 0.5], [0.5, 1.0], [1.0, 1.5], [1.5, 2.0], [2.0, 2.5], and [2.5, 3.0]. The width of each of these subintervals is . Therefore, the change in t over each subinterval, Δt, can be stated as follows.