Can someone help me with my math quiz tomorrow??

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

Witch represents the inverse of the function f(x)=1/4x-12

The anwser cause i do not understand just plez