Identify the endpoints of the primary interval.
\(y = 100 sin [\frac{\Pi}{9}(t + 4)]\)
a. (7, 27)
b. (-7, 13)
c. \((\frac{-7\Pi }{10}, \frac{13\Pi}{10})\)
d. \((\frac{7\Pi}{10},\frac{27\Pi}{10})\)
