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Anonymous
20 to the second power is more commonly known as 202 or 20 squared. Squaring is calculated by taking two of the number and multiplying them together. In this case, 20x20=400 and so 20 to the 2nd power is 400.
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21 to the 2nd power is 441.
91 to the 2nd power is 8,281.
20 to the fifth power is... 3,200,000
22x52x7 4x25x7 100x7 700