GRE Exam Numerical Ability Algebra

How many real roots does the polynomial 2x^5 + 8x – 7 have?
(A) None
(B)One
(C) Two
(D) Three
(E)Five

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GRE Other Question

What is the volume of the solid formed by revolving about the x-axis the region in the first quadrant of the xy-plane bounded by the coordinate axes and the graph of the equation y = 1/(Sqrt(1+x^2).
(A) Pi/2
(B) Pi
(C) Pi^2/4
(D) Pi^2/2
(E) Infinite Let V be the real vector space of all real 2*3 matrices, and let W be the real vector space of all real 4*1 column vectors. If T is a linear transformation from V onto W, what is the dimension of the subspace.
(A) 2
(B) 3
(C)4
(D) 5
(E) 6