Is it 1/2x2 + 1/5x a polynomial

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

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

How do the definitions, properties, and postulates you've learned about line segments, parallel lines, and angles to define the shapes of polygons