Pollution Levels in Lake Erie Have Been Modeled by the Equation

question 52

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 t=0. ​

• A) 0.23 km³​
• B) 0.2 km³​
• C) 0.40 km³​
• D) 0.10 km³​
• E) 0.8 km³​

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