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Math Help - Math B regents exam help!!!

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    Unhappy Math B regents exam help!!!

    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
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    Quote Originally Posted by juldancer View Post
    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!
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    Quote Originally Posted by juldancer View Post
    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 \theta is cos(\theta) = -1? The answer is for \theta = 3 \pi / 2. So you know that
    \frac{\pi}{5}t = \frac{3 \pi}{2}

    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 2 \pi. So for what value of t do we have
    \frac{\pi}{5}t = 2 \pi

    That's the period.

    -Dan
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