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.

Answer 1

each interval has width 2, so the midpoints are at 1,3,5,7,9

Answer 2

1, 3, 5, 7, 9 is the correct answer.