## Sbdenney Group Title PLEASE HELP The rotating light on a lighthouse is 400 feet from a cliff. It completes one rotation every 10 seconds. The equation representing the distance, d, in feet that the center of the circle of light is from the lighthouse is d(t) = 400sec (πt/5). What is the period of d(t)? (Enter only the number.) 2 years ago 2 years ago

1. Sbdenney Group Title

Turing test do you know?

2. TuringTest Group Title

If your just asking about the period I don't see why it gives the whole thing about distance. $\sec x={1\over \cos x}$and these functions in the form of $A \cos(Bx+C)$ where the period is${2\pi \over \left| B \right|}$so the period of your function is ${2\pi \over{\pi \over 5}}=10$I just don't see what to do with the rest of the info.

3. Sbdenney Group Title

ok thanks IT WAS RIGHT

4. TuringTest Group Title

But why all the extra info... seems weird :/