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To find the area of the composite figure, we first need to calculate the area of each individual shape separately, then add them together.
Area of the rectangle = length x width
= 3 miles x 6 miles
= 18 square miles
Area of the triangle = 1/2 x base x height
= 1/2 x 1 mile x 7 miles
= 3.5 square miles
Total area of the composite figure = 18 square miles + 3.5 square miles
= 21.5 square miles
Therefore, the closest option to the area of the composite figure is 21 square miles.