Chapter 12.3, Problem 11TE

a.

To determine

To plot: The graph of $P\left(t\right)=20+12\sin \left(\frac{\pi t}{30}\right)-6\sin \left(\frac{\pi t}{15}\right)+4\sin \left(\frac{\pi t}{10}\right)-3\sin \left(\frac{2\pi t}{15}\right)$ using the viewing window $\left[0,20\right]\times \left[15,35\right]$.

b.

To determine

To find: The rate of change of the stock’s price at the close of the 23^rd day of trading.

c.

To determine

To find: The closing price on the 23^rd day.