DEPRECATED Writing expressions with exponents word problems

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Maggie has a big piece of paper that she folds in half. When she opens it, she sees that she has 2 rectangles. Now she folds it in half a second time. When she opens it, she sees 4 rectangles. When she folds it 3 times and then opens it, she sees 8 rectangles. The number of rectangles is doubling every time she folds the paper.
Write a numerical expression with exponents that describes the number of rectangles she would see if she folded the paper 11 times.