Solve the Problem $f ( x ) = 300 ( 0.5 ) ^ { x / 90 }$

question 220

Multiple Choice

Solve the problem.
-The function f $f ( x ) = 300 ( 0.5 ) ^ { x / 90 }$ 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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