Solve the Problem $f ( x ) = 300 ( 0.5 ) ^ { x / 100 }$

question 164

Multiple Choice

Solve the problem.
-The function $f ( x ) = 300 ( 0.5 ) ^ { x / 100 }$ 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 120 years. Round to the nearest whole number.

• A) 131 pounds
• B) 168 pounds
• C) 180 pounds
• D) 125 pounds

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