What will the denominator for this problem be?

10
15
9
8

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

Equation for the calculation double 2 and then add 5

In the diagram, gef and hef are congruent. what is the value of x