Is this proportional or non-proportional?

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

If you answer right ill give brainliest, : )

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