select one: a. line ab lies on two of the planes pictured. b. line ab lies on only one of the planes pictured. c. line ab lies on all three planes pictured d. line ab doesn't lie on any of the planes pictured
List x1, x2, x3, x4 where xi is the midpoint endpoint of the five equal intervals used to estimate the area under the curve of f(x) between x = 0 and x = 10.