Help me plz i dont get it

Astudent simplified a rational expression as shown.

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

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