simplify complex fraction3/4 + 1/3/1/6 + 3/4

Need on this geometry question. explain how you did it.

Given the graphed function below which of the following orders pairs are found on the inverse function

List x1, x2, x3, x4 where xi is the left endpoint of the four equal intervals used to estimate the area under the curve of f(x) between x = 4 and x = 6. a 4, 4.5, 5, 5.5 b 4.5, 5, 5.5, 6 c 4.25, 4.75, 5.25, 5.75 d 4, 4.2, 5.4, 6