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The sign is in the shape of a trapezoid. To find the area of a trapezoid, you use the formula A = (1/2) * (b1 + b2) * h, where b1 and b2 are the two bases and h is the height.
In this case, the bases are 5.5 feet and 9 feet, and the height is 4 feet.
Plugging these values into the formula, we get:
A = (1/2) * (5.5 + 9) * 4
A = (1/2) * 14.5 * 4
A = 7.25 * 4
A = 29 square feet
Therefore, the area of the sign is 29 square feet.
The correct answer is 29 square feet.