How is 37 1/2% = 3/8​

Guys i really need or i have to stay late up night

Based on the figures as marked, /\rqs = —

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