Perform the indicated operation.
? 
A. 
B. 
C. 
D. 
Answer: D
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Use the Montonicity Theorem to find where the function is increasing and where it is decreasing.f(x) = (x + 2)(x - 6)
A. Increasing on [2, ?), decreasing on (-?, 2] B. Decreasing on (-?,?) C. Increasing on [-12, ?), decreasing on (-?, -12] D. Increasing on (-?, -2] ? [6, ?), decreasing on [-2, 6]
Identify and graph the polar equation.r = 1 - sin ? 
A. 
cardioid
B. 
cardioid
C. 
cardioid
D. 
cardioid
Use Cramer's rule to solve the system of equations. If D = 0, use another method to determine the solution set.-3x - 7y - 6z = -65 5x + 9y - 5z = 43 9x - 9y + 8z = 95
A. {(10, 0, 4)} B. {(2, 4, 2)} C. {(9, -2, -4)} D. {(9, 2, 4)}
Solve the problem.The function F described by F(C) = 
C + 32 gives the Fahrenheit temperature corresponding to the Celsius temperature C. Find and interpret F(-20).
A. -4°F; A temperature of -4°C is equivalent to -20°F. B. -40°F; A temperature of -20°C is equivalent to -40°F. C. -4°F; A temperature of -20°C is equivalent to -4°F. D. -112°F; A temperature of -20°C is equivalent to -112°F.