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John is trying to determine the length of the staircase he will need for a deck that is 12 feet high. He wants to start the stairs 21 feet from the deck.

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irspow

Answer:

Step-by-step explanation:

[tex]L^2=21^2+12^2\\ \\ L^2=585\\ \\ L=\sqrt{585}\\ \\ L=3\sqrt{65}[/tex]

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