Iridium is a radioactive element used for therapy in nuclear medicine. It decays to ½ or 2-1, of its original mass after 74 days. After 148 days, it decays to ¼, or 2-2, of its original mass. What fraction remains after 222 days? Write fraction as a power of 2 with a negative exponent also. What fraction remains after 370 days? Write fraction as a power of 2 with a negative exponent also.

Iridium is a radioactive element used for therapy in nuclear medicine. It decays to ½ or 2-1, of its original mass after 74 days. After 148 days, it decays to ¼, or 2-2, of its original mass. What fraction remains after 222 days? Write fraction as a power of 2 with a negative exponent also. What fraction remains after 370 days? Write fraction as a power of 2 with a negative exponent also.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter4: Factors, Fractions, And Exponents

Section4.6: Negative And Zero Exponents

Problem 15E

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Question

Iridium is a radioactive element used for therapy in nuclear medicine. It decays to ½ or 2^-1, of its original mass after 74 days. After 148 days, it decays to ¼, or 2^-2, of its original mass.

What fraction remains after 222 days? Write fraction as a power of 2 with a negative exponent also.
What fraction remains after 370 days? Write fraction as a power of 2 with a negative exponent also.

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