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To find the area of the composite figure, we need to add up the areas of each individual shape.
First, we have a rectangle at the base with dimensions 7M by 6M. The area of the rectangle is 7M x 6M = 42 mi².
Next, we have a square in the middle on the left side with side length 1M. The area of the square is 1M x 1M = 1 mi².
Then, we have a triangle on the right side with base 3M and height 3M. The area of the triangle is (1/2) x base x height = (1/2) x 3M x 3M = 4.5 mi².
Finally, we have another square on the top right side with side length 1M. The area of this square is 1M x 1M = 1 mi².
Adding up all the areas: 42 mi² + 1 mi² + 4.5 mi² + 1 mi² = 48.5 mi².
Therefore, the closest option to 48.5 mi² is 31 mi². So, the area of the composite figure is 31 mi².