document.write( "Question 748206: The water level varies from 12 inches at low tide to 52 inches at high tide. Low tide occurs at 9:15 am. High tide occurs at 3:30 pm. What is a cosine function that models the variation in inches above and below the water level as a function of time and hours since 9:15 am? \n" ); document.write( "

Algebra.Com's Answer #527619 by yahkay(1) $\"\"$ $\"About$

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20*cos(x-3.5)+32 \n" ); document.write( "

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