A radioactive material, such as one of the thorium isotopes, thorium-234, decays at a rate proportional to the amount present. If Q(t) is the amount present at time t, then dQ/dt = −rQ where r> 0 is a decay rate. If 80 mg of thorium-234 decays to 75 mg in one (1) week, the rate of r decay is, Check the correct alternative: a. r=−0.1855 b. r=0.0258 c. r=0.5323 d. r=0.0645 e. r=0.1645

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