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**needmathshelp** Given a set date from teh calender and a starting time

Date: 21/09/06

Time: 5am

How do you equate the tides for a 24-hour period after this time and date to an equation of the form y=a cos b(x-c)+d. I know the answer should include a sketch of the function, where teh x-axis represents time in hours (0<t<24) and I am given the starting time t=0

The low tides are:

Time Height(m)

0233 0.67

0840 3.54

1439 0.71

2045 3.96

So the high tide is 3.75 m and the low tide is 0.69m

If you can help that'd be great thanx