Jay is doing his mathematics homework on the run. He managed to squeeze in one problem between lunch and his expository writing class. He used his calculator to find Ln, Rn, Tn, and Mn, to approx- imate a definite integral and jotted down the results on a napkin. The values of Ln, Rn, Tn, and Mn were: 0.367617, 0.3211885, 0.341189, and 0.274760. He didn't write down the problem, nor did he record the value of n he used. But he did sketch the function (over the relevant interval) on the napkin; it looked like this. x He wants your help in labeling the data he recorded as a left-hand sum, a right-hand sum, a midpoint sum, and a trapezoidal sum. Which is which? Explain your answer in complete English sentences.