Question 1042448
.
In Crescent Moon Bay in July, high tide is at 3:00 pm. The water level is 6 feet at high tide and 2 feet at low tide. 
Assuming the next high tide is exactly 12 hours later and the height of the water can be modeled by a cosine curve, 
find an equation for Crescent Moon Bay's water level in July as a function of time (t).
~~~~~~~~~~~~~~~~~~~~~~~~


<pre>
h(t) = {{{4 + 2*cos(2pi*((t-3)/12))}}},

where t is time in hours, t=0 at midnight till t=24 next midnight. 
</pre>

<TABLE> 
  <TR>
  <TD> 

{{{graph( 640, 330, -2.5, 26.5, -1.5, 7.5,
          4 + 2*cos(2pi*((x-3)/12))
)}}}


Plot h(t) = {{{4 + 2*cos(2pi*((t-3)/12))}}}

  </TD>
  </TR>
</TABLE>