What is the numerical coefficient of the expression -(m^2 p)/5?

In the algebraic expression 〖9x〗^2 what is the literal coefficient? *
A. 〖 x〗^2
B. x
C. 〖 9x〗^2
D. 9

Which of the following monomials has the highest degree? *
A. -9x^8
B. (3 〖(xy)〗^2)/5
C. (8)(3)〖xyz〗^3
D. 〖 〖6 x〗^4 y〗^5​