Which of the following are polynomials?
I. f(x)=3√x4−23x6+8.7
II. g(x)=ln(7x3+5)
III. h(x)=6ex5−3x4
IV. j(x)=7x3+5x49x6
V. k(x)=3x8.7+6x23−8
VI. F(x)=10
VII. G(x)=−6x−7+6x−4−27
VIII. H(x)=4xπ+18x4+35