Y=2x 7x-2y=15i'm not so sure on how to solve this question , me i have a maths test tmr : ( you so much

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

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.

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?