Solve the problem.The temperature of water in a certain lake on a day in October can be determined by using the model 
where x is the number of feet down from the surface of the lake and y is the Celsius temperature of the water at that depth. Based on this model, at what depth is the water 9 degrees? (Round to the nearest foot.)
A. 67 ft
B. 12 ft
C. 45 ft
D. 30 ft
Answer: B
Mathematics
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+ 
A. 
B. 
C. 
D. 
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Complete the equation so the result is an identity. 
= ___
A. sin x + 1 B. cos x + 1 C. sec x + 1 D. csc x + 1
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Perform the indicated operation. Simplify if possible.
+ 
A. 
B. 6
C. 1
D. m
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Find the slope of any line that is perpendicular to the line 
.
A. 
B. 
C. 
D. 
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