Question 1150036
{{{ H(t) = -4*cos( (( t/36.5 )*( 2pi ) ) + pi/3 ) }}}
(a) The amplitude is {{{ (1/2)*8 = 4 }}}
(b) When {{{ t = 36.5 }}}, the tide is back to starting level of {{{ -2 }}}
(c) When {{{ t = 0 }}}, {{{ -4*cos( pi/3 ) = -2 }}} and rising
Here is the plot:
{{{ graph( 800, 400, -45, 45, -5, 5, -4*cos( ( x/36.5 )*( 2pi ) + pi/3 )) }}}
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If needed, get a 2nd opinion, too
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I asked the doctor for a 2nd opinion, and he said, "OK. You're ugly."