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Noah's school is due west of his house and due south of his friend Janelle's house. The distance between the school and Janelle's house is $$5.1$$ miles and the straight-line distance between Noah's house and Janelle's house is $$6.4$$ miles. How far is Noah's house from school? If necessary, round to the nearest tenth.
$$d= \sqrt{6.4^{2}- 5.1^{2} } = 3.9$$