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

Try drawing the graph on the grid provided ......

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Thanks for the suggestion!

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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