The number of hours in a day is f(x)=2.8 sin(2π/365(x-80))+12.2, x is number of days into a year. How many hours of daylight is there on the 140th day of the year?

Answer 1

f(x)=2.8 sin(2π/365(140-80))+12.2=

14.6045 hours of daylight

140th day of the years, May 20,2021