Chapter 14 Trigonometric Graphs, Identities, and Equations - 14.5 Write Trigonometric Functions and Models - 14.5 Exercises - Problem Solving - Page 946: 27b

$23100$ Employees

From the previous part (a), we have $N=0.38 \sin (0.776t+5.58) +20.4 $ Plug $t=12$ in order to get the value of $N$. We have $N=0.38 \sin (0.776 \times (12)+5.58) +20.4 $ Thus, we have $N \approx 23.1$ This means that we find about $23100$ employees.