5.3 Exercise 93

The amount of sunlight in a certain city can be modeled by the function $h = 16 \cos \left(\frac{1}{500} d\right) ,$ where $h$ represents the hours of sunlight, and $d$ is the day of the year. Use the equation to find how many hours of sunlight there are on September 24, the 267^th day of the year. State the period of the function.