Quote:
Originally Posted by juldancer  I am extremely confused by #31 on the Math B June 2007 regents exam. If someone could help me, that would be so so so amazing. I was able to figure out that the the minimum annual snowfall is 10 inches, but I don't know how to get the second part.
Here is the link to the exam : http://www.nysedregents.org/testing/mathre/b-607.pdf | For what values of  is  ? The answer is for  . So you know that 
Solve for t. That tells you when the first minimum will occur. Now we need to find the period. The period of the cosine function is  . So for what value of t do we have 
That's the period.
-Dan
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