Which of the following includes a coefficient?

A 3x + 2

B a_11

C 6 x 4 = 24

D 3, 6, 9, 12 ...

A 3x + 2

Step-by-step explanation:

3x+2 is a polynomial.

If the variable in a term of polynomial is multiplied by a number, then this number is called the "coefficient"

It contains a first degree term as highest degree term and one constant term.

coefficient=3

constant=2

variable=x (first degree term)