2x+4 or -x^4+4x^3-5x^2 are examples of a , the sum or difference or monomials

A. Product
B. Polynomial
C. Power
D. Perfect square root

Can someone plz me understand how to do these. plz, show work.in exercises 1-4, rewrite the expression in rational exponent form.[tex]\sqrt[4]{625} \sqrt[3]{512} (\sqrt[5]{4} )³ (\sqrt[4]{15} )^{7}\\ (\sqrt[3]{27} )^{2}[/tex]

Solve for the equation. 4x - 13 = 2x + 9

What is the 8th term of the geometric sequence with this explicit formula? an= )(n-1)