state of decay of radium is proportional to the amount present at any time. Suppose that 200 mg of radium are currently present, and the amount decreases after every hour. After 2 hours, it decreases to 140. How much radium will be left after3 hours if the decrease in number is constant? a. 115 b. 116 c. 117 d. 118

state of decay of radium is proportional to the amount present at any time. Suppose that 200 mg of radium are currently present, and the amount decreases after every hour. After 2 hours, it decreases to 140. How much radium will be left after3 hours if the decrease in number is constant? a. 115 b. 116 c. 117 d. 118

College Algebra

10th Edition

ISBN:9781337282291

Author:Ron Larson

Publisher:Ron Larson

Chapter5: Exponential And Logarithmic Functions

Section: Chapter Questions

Problem 28T: The half-life of radioactive actinium ( 227AC ) is 21.77 years. What percent of a present amount of...

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