Reduce the fraction by finding a common factor in the numerator and in the denominator and dividing by the common factor.
A. 
B. 
C. 
D. 
Answer: C
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Graph the pair of parametric equations with the aid of a graphing calculator.x = 2 tan t, y = 3 sec t; -?/2 ? t ? ?/2
A. 
B. 
C. 
D. 
Perform the indicated operation. Simplify if possible.
+ 
A. x - 3
B. x + 6
C. x - 6
D. 
Use Cramer's rule to solve the system. If D = 0, use another method to complete the solution. x + y + z + w = 7 3x - 2z + 5w = 11-4x + 3y + w = 4 -x - y - z - w = 6
A. ?
B. 
C. 
D. 
Solve the problem.After introducing an inhibitor into a culture of luminescent bacteria, a scientist monitors the luminosity produced by the culture. Use a graphing utility to fit a logarithmic function to the data. Predict the luminosity after 20 hours.
A. y = 100.5 - 32.7 ln (x), 2.54 B. y = 112.97 - 45.97 ln (x), -24.74 C. y = 98.75 - 32.66 ln (x), 0.91 D. y = 107.55 - 41 ln (x), -15.27