Thaddeus models the number of hours of daylight in his town as D(t) = 3sin(t) + 12, where Dis the number of daylight hours and tis the
time in months since January 1.
What are the least and greatest numbers of daylight hours over the course of
a year?
A. Least: 7.5 hours; greatest: 15 hours
B. Least: 3 hours; greatest: 12 hours
C. Least: 6 hours, greatest: 12 hours
D. Least: 9 hours; greatest: 15 hours