Plz need fast for a test

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

The square root of 9x plus 7 plus the square rot of 2x equall to 7

How are sas and sss used to show that two triangles are congruent?