To see what you should post in the discussion and the rubric for how you will be graded, go to Discussions and scroll down to Lesson Discussions for the description. In Philadelphia the number of hours of daylight on day t (where t is the number of days after January 1) is modeled by the function L ( t ) = 12 2 . 83 sin 2 365 ( t - 80 ) a) Which days of the year have about 10 hours of daylight? b) How many days of the year have more than 10 hours of daylight