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4.04366: 3. Ifthere are 100 grams of a radioactive substance that decays according to the formula: y = yoe . How long before only 20

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4.04366: 3. Ifthere are 100 grams of a radioactive substance that decays according to the formula: y = yoe . How long before only 20 grams of material are left? 3. 4. Solve the following for x: a. log? (at2 + 9x) = log? (x + 9) a. b. log5(x2 + 4x) = 1 b. c. log(x + 6) log(x 2) = log 7 d. log(2x + 3) + log4 = 2

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