Ginny is studying a population of frogs. She determines that the population is decreasing at an average rate of 3% per year. When she began her study, the frog population was estimated at 1,200. Which function represents the frog population after x years?

A population that decreases by 3% each year retains 100% − 3% = 97% of its size each year, so the yearly multiplier is 0.97. Starting with 1,200 frogs, the population after x years is f(x) = 1,200(0.97)^x. Therefore, choice C is correct.

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