Help formulating sine function

The population of beavers can be modeled by a sine function f(x), where x is time in days. at t=0 the number of beavers is at its average of 100, the highest number is measured to be 125. The cycle starts again after 12 days. at x=0 the population is decreasing.

give the function rule and population after 41 days


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Mathe Mathe
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