Write the coefficient and constant term of the following expressions: 

$5a{b}^{2}c-4ab+1$

Write the coefficient and constant term of the following expressions: 

$3+a^2-5b^2$

Write the coefficient and constant term of the following expressions: 

$-ab+2a^2{b}^2+5$

List the like terms in the following: 

$6a, 13b^2, -2a, 2a^2, -b^2, bc$

List the like terms in the following: 

$4x^2, -5x, 6, 7x, -2x^2, -3$

List the like terms in the following: 

$2a^2{b}^2, 6a^{2}b, 2a{b}^2, -3a^2{b}^2, 7a{b}^2, -9a^{2}b$

Add the following algebraic expression.

$x^2, 2x^2, -6x^2$