Wht do I put?? Can some one help pls

Ineed asap. i cant understand this question i need someone to me right away

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

Simplify the expression. -2/5(10+15m-20n)