There are 20 students in our class who prefer chocolate ice cream. There are 6 students in our class who prefer vanilla ice cream, Select all of the ratios that represent the number of students who prefer chocolate ice cream to the number of students who prefer vanilla ice cream

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