Use the model to find the period of the function. А. 2 years В. 9 years С. 11 years D. 22 years

Extracted text: Use the model to find the period of the function. А. 2 years В. 9 years С. 11 years D. 22 years


Extracted text: Recent studies seem to indicate the population of North America porcupine (Erethizon dorsatum) varies sinusoidally with the solar (sunspot) cycle due to its effects on Earth's ecosystems. Suppose the population of these species in a certain locality is modeled by the function P(t) = 250cos (t) + 950 where P(t) represents the population of porcupines in year t.