By definition we have to:
Monomy: Algebraic expression that consists of a single term or in which the terms that form it are related by the product operation.
For example:
ax^2
It is a monomial.
In this case we have the following expression:
18x
Using the given definition, we have that the expression is a monomial.
Answer:
A .. monomial
12 +4m = 24
4m = 12
m = 12/4
m = 3 so choice C. is right sure
Both are equal y. So you can set them equal to each other
9x+13=2x+48
Subtract 2x from both sides
7x+13=48
Subtract 13 from both sides
7x= 35
X=5
I’m sorry, I wish I knew this one and I would help