#### Answer

a. $\quad 2$
b. $\quad 9$
c. $\quad 4$
d. $\quad$no like terms

#### Work Step by Step

a.
The terms of an algebraic expressions are those parts separated by addition.
It can be a number, a variable, or a number times one or more variables.
In $9x+4$, TWO terms are separated by addition
b.
The numerical part of a term is called its coefficient.
If a term is written without a coefficient, the coefficient is understood to be 1
The numerical coefficient of $9x$ is $9.$
c.
A term that consists of just a number is called a constant term.
In $9x+4$, the constant term is $4$.
d.
The parts of each term that are multiplied are called the factors of the term
Like terms are terms that have exactly the same variable factors.
$9x$ and $4$ do not have identical variable factors.
There are no like terms,