PLEASE HELP!! Which question was answered with variable data?

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct

How can i differentiate this equation?