Find the equilibrium point (x,p) of the demand and supply equations. The equilibrium point is the price p and number of units x that satisfy both the demand and supply equations.
?
Demand Supply 
?
A. (250, 445)?
B. ??(445, -250)?
C. ?(445, 250)?
D. ?(-250, 445)?
E. ?(-250, -445)?
Answer: A
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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.
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B. y = 4 sin 
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