Simplify by combining like terms: 2x + 1 + 7x

Which of the binomials below is a factor of this trinominal? x^2-13+30

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

Which of the following is the result of expanding