Test: SAT Mathematics

1.

Researchers have modeled the extent of ice loss in Greenland using the equation , where  represents the surface area of Greenland covered by ice, in square kilometers, measured on September 30 of each year,  represents the 12.8% rate at which ice is lost each year, and  represents the number of years that have elapsed since the study began in 1979. What is the meaning of the number  in this equation?

The number of square kilometers of ice remaining in Greenland

The number of square kilometers of ice in Greenland as of September 30, 1979

The average percent decrease in ice in Greenland each year since 1979

The number of square kilometers of ice that Greenland loses each year

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