$\"\"$

(a)

The equation for height of the wave is $\"\"$ .

Where $\"\"$ is period in seconds and $\"\"$ is propagation of wave in seconds.

Write an equation for the wave when $\"\"$ and $\"\"$ .

Substitute all the values.

$\"\"$

$\"\"$ .

The wave equation is $\"\"$ .

Graph :

Graph the function $\"\"$ .

$\"\"$

$\"\"$

(b)

Find the number of times , the graph predict the wave to be one foot high over 10 seconds.

$\"\"$

Observe the graph:

The graph predict the wave to be one foot high will be $\"\"$ times during the first $\"\"$ seconds.

$\"\"$

(a)

Graph of the function $\"\"$ is

$\"\"$

(b) The graph predict the wave to be one foot high will be $\"\"$ times during the first $\"\"$ seconds.