Need an answer to the problem in the image.

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

Collin did the work to see if 10 is a solution to the equation r/4=2.4

Which of the following is closest to 32.9 x 7.5? a: 232 b: 259 c: 220 d: 265