# Pre-Calculus

posted by
**Lucy**
.

The paddle wheel of a boat measures 16 feet in diameter and is revolving at a rate of 20 rpm. The maximum depth of the paddle wheel under water is 1 foot. Suppose a point is located at the lowest point of the wheel at t=0.

1) Write a cosine function with phase shift 0 for the height above water at the initial point after t seconds

2) use your function to find the height of the initial point after 5.5 seconds

3) and find the values of x for which the equation sin x= -1 is true.

Thanks for any assistance