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July 7, 2015

Homework Help: trig

Posted by Kelslie on Monday, May 4, 2009 at 8:28pm.

A city averages 14 hours of daylight in June, 10 in December, 12 in both March and September. Assume that the number of hours of daylight varies sinusoidally over a period of one year. Write an expression for n, the number of hours of daylight, as a cosine function of t. Let t be in months and t=0 correspond to the month of January.

My work:
y=2cos((pi/6(x-d))+12

Ok how would I get the phase shift? Thanks in advance

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