2x+5=10-3x please help

Which expression is equivalent to 2x^2+2x-4/2x^2-4x+2

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

(60 points) explain this in detail