I suppose the polynomial is . To find the which degree this polynomial is, we consider the highest exponent of the term which is , the 5 is our highest degree of the term and thus, 5 is our highest degree of polynomial.
I'm assuming that the 5 in "3x5" is supposed to be a exponent. The degree of the polynomial is the greatest of the exponents (powers) of its various terms.
G divides each median in the ratio of 2 to 1 (the longer side goes from G to the angle)
triangle AMN is similar to triangle ABC (why?)
AMN is a scaled version of ABC (by a factor of ⅔)
its area should be scaled by (⅔)^2