Which expression is equivalent to the given expression? 13x – 29x a. x(29 – 13) b.13(x + 29) c. x(13 – 29) d.13(x – 29)

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