in a given region, the number of daylight hours vaires, depending on the time of year. this variation can be approximated with a sinusoidal function. the model for a certain region is given by the function d(t)= 5sin 2pie/365 (t-95)+13, where d(t) is in hours and t represents the number of days after January 1. find two days whent he approximate number of daylight hours is 16h.