Find the sum of the series 20 E n = 1 4n = 1

Pick the description of a geometric object that best matches the real world object box for a deck of card

The amount of energy it takes to lift a box might be a function of which of the following

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