Please what is the answer to this

Pls i’m dumb as heck i’ll give y’all so many points if that encourages you

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

In order to be invited to tutoring or extension activities a students performance 20 point higher or lower than average for the