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OpenStudy (anonymous):
The number of daylight hours y at 60degreesN latitude can be modeled by: y=6.5sin(pi/6(x-3.65))+12.4 where x=1 corresponds to January 1, x=2 to February 1, and so on. Estimate symbolically where there are 9 hours of daylight. a. near Feb.17 and oct 22 b. near March 19 and Novemeber 22 c. near February 22 and Oct. 17 d. near Feb. 19 and Nov. 22 HELP?
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