Pollution Levels in Lake Erie Have Been Modeled by the Equation

question 50

Multiple Choice

Pollution levels in Lake Erie have been modeled by the equation , where x is the volume of pollutants (in cubic kilometers) and t is the time (in years) (Adapted from R. H. Rainey, Science 155 (1967) , 1242-1243) . Find the initial pollution level; that is, find x when . ​

• A)0.23 km³
• B)0.1 km³
• C)0.40 km³
• D)0.20 km³
• E)0.7 km³

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