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Mathematics, 03.07.2019 19:30 kids2006

At 9am the temp was -10 degrees f and at noon it was 28 degrees f. how much did the temp change? ((i already tried doing -10+28=18 but my teacher said it was wrong))

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At 9am the temp was -10 degrees f and at noon it was 28 degrees f. how much did the temp change? ((...
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