Final answer:
The length of the base of the parallelogram is (6x^2 + x + 3) / (3x), which is equivalent to option d) (2x).
Step-by-step explanation:
The area of a parallelogram is given by the formula:
Area = base x height
Given that the area of the parallelogram is represented by (6x^2 + x + 3), and the height is (3x), we can substitute these values into the formula:
(6x^2 + x + 3) = base x (3x)
To find the value of the base, we can solve for base:
base = (6x^2 + x + 3) / (3x)
Therefore, the length of the base is (6x^2 + x + 3) / (3x), or option d) (2x).