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6. The weight of a radioactive isotope after t years is given by Wt = 2500 x 3 grams. a Find the initial weight of

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6. The weight of a radioactive isotope after t years is given by Wt = 2500 x 3 grams. a Find the initial weight of the isotope. b Find the time taken for the isotope to reduce to 30% of its original weight.4. Find x if: a log, = -3 b log5 I ~ 2.743 c log; I ~ -3.145

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