Answer:
5x linear monomial
-7 constant monomial
x^2+4 quadratic binomial
x^2-3x+11 quadratic trinomial
2x-9 linear binomial
Explanation:
Linear indicates a line, the power of x in the equation is 1 (which we never write the power one, so it looks like just x)
Quadratics have an x to the power of 2
A constant is a plain number with no variable.
The prefixes mono-, bi-, and tri- can help you with these. Mono- means one. Monomials have one term, such as 5x or -7
Bi- means two. Binomials have two terms such as x^2+4 or 2x-9.
Tri- means three. Trinomials have three terms such as x^2-3x+11.