The height, h, in feet of a piece of cloth tied to a waterwheel in relation to sea level as a function of time, t, in seconds can be modeled by the equation h = 8 cosine (StartFraction pi Over 10 EndFraction t). What is the period of the function?

  20 seconds

Step-by-step explanation:

The period is the value of t that makes the cosine argument change by 2π.

That value is ...

  2π = π/10t

  20 = t . . . . . . . multiply by 10/π

The period of the function is 20 seconds.

the first one, all those points on the line just make a strait line.

the square root of what number? if you add that, then someone will probably answer the question.