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Mathematics, 07.09.2021 14:00 beto66

The number 21 X09 is equal to 22 000, correct to 2 significant figures. Find the value of X if 21 X09 is a perfect square. I lucky guessed the answer is 6 but I need to know how thanks​

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The number 21 X09 is equal to 22 000, correct to 2 significant figures. Find the value of X if 21 X0...
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