According to Table 1, the appropriate radioactive isotope to use to estimate the age of a rock from a rock formation believed to be a billion years old is A)carbon-14. B)potassium-40. C)radium-226 D)thorium-230

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According to Table 1, the appropriate radioactive isotope to use to estimate the age of a rock from a rock formation believed to be a billion years old is potassium-40.

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Asked 7/11/2018 6:33:21 PM

Updated 76 days ago|11/1/2024 12:54:19 AM

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Yolanda spends 8 2/3 hours per month playing soccer. Approximately how many hours does she play soccer in a year? A. 28 B. 104 C. 416 D. 197

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Updated 7/11/2018 11:04:30 PM

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mittal2a

Yolanda spends hours per month playing soccer = 8 2/3 = 8 hours +2/3 *60 = 8 hours 40 min, Yolanda spends hours per year = 8 hours 40 min * 12 = 96 hours + 480 min = 96 hours + 8 hours = 104 hours.

Added 7/11/2018 11:04:30 PM

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Confirmed by alfred123 [7/12/2018 5:45:50 PM], Rated good by alfred123, alfred123 [7/12/2018 5:45:50 PM]

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