Solve the problem.Tides go up and down in a 14.8-hour period. The average depth of a certain river is 12 m and ranges from 8 to 16 m. The variation can be approximated by a sine curve. Write an equation that gives the approximate variation y, if x is the number of hours after midnight and high tide occurs at 9:00 am.
A. y = 4 sin 
+ 12
B. y = 4 sin 
+ 12
C. y = 12 sin 
+ 4
D. y = 12 sin 
+ 4
Answer: A
Mathematics
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