The length of daylight is approx a sinusoidal function of the day of the yr. The longest day is june 21, the 172 day of the year. The longest day has 14 hr 3 min of daylight. The shortest is 10 hr 15 min. Write equation to express the length of daylight in min/day as a function of day of the year. How much daylight is there on august 7?