-0.000121t Refer to the model Q (t) = Qoe used for radiocarbon dating. At an archeological site, scientists uncovered human remains. A sample from a human bone taken from the site showed that 37% of the carbon-14 still remained. How old is the sample? Round to the nearest year. Do not round intermediate calculations. The sample from the human remains is approximately years old.

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A: Given,  a→ = 2, 4b→ = -3, 5c→ = 1, -4d→ = -5, -3 We have to find a→+ c→.

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