Solve the problem.Tides go up and down in a 12.4-hour period. The average depth of a certain river is 10 m and ranges from 5 to 15 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 5:00 am.
A. y = 5 sin 
+ 10
B. y = 10 sin 
+ 5
C. y = 10 sin 
+ 5
D. y = 5 sin 
+ 10
Answer: A
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