I need some help with these trigonometry questions anyone

If 50% of a number is 14 then 100% of the number is

Select the quadratic that has root x = 8 and x = -5

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