### Home > INT3 > Chapter 11 > Lesson 11.1.3 > Problem 11-37

11-37.

Eliana is still working hard on her senior project. She has recorded the sunset time for at least one day a month through December. Her graph of the data is shown at right.

Write a function that models the time the sun sets as a function of the week #, where June 1 is Week 1.

One possibility is to use cosine.

Find the variables for

.What time should Eliana predict the sunset to take place during the first week of March (week 41)?

Substitute

into the answer from part (a).