Final answer:
The expression that represents the area of the trapezoid is c) 3x^2+3x+6.
Step-by-step explanation:
The formula for finding the area of a trapezoid is:
Area = (1/2) × (base1 + base2) × height
In this case, the expression that represents the area of the trapezoid is c) 3x^2+3x+6 because it follows the formula and matches the given figure.