Choose the One Alternative That Best Completes the Statement or Answers

question 288

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
-The function $f ( x ) = 300 ( 0.5 ) ^ { x / 90 }$ models the amount in pounds of a particular radioactive material stored in a concrete vault, where $x$ is the number of years since the material was put into the vault. Find the amount of radioactive material in the vault after 200 years. Round to the nearest whole number.

• A) 333 pounds
• B) 220 pounds
• C) 68 pounds
• D) 64 pounds

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