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Q21: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6590/.jpg" alt=" A) odd B)
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Q89: The number of quarters needed to
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Q97: A rule for estimating the number
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Q255: A certain radioactive isotope has a half-life
Q279: <img src="https://d2lvgg3v3hfg70.cloudfront.net/TB6590/.jpg" alt=" A) Yes B)