Evaluate the expression if f=-6, g=7, and h=9 g-7 -h - (-9) f-g

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

I’m still confused on how to work the percentages

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?