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Rebecca left her house and walked 2 blocks east. She turned and walked 5 blocks north to get
to the library. How far is the direct route from Rebecca's house to the library?

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Answer:

If you talking about how many blocks she needs to walk, the answer is simple: 5 + 2 = 7

But if you use blocks as a sort of lenght measurement system, it's

[tex] \sqrt{7 {}^{2} + 5 ^{2} } [/tex]

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