Find the cofactor of the indicated element of the matrix shown.a21;
A. -7
B. -11
C. 7
D. 11
Answer: A
Mathematics
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Use Cramer's rule to solve the system.2.5x + 2.2y = 40.11.0x - 2.3y = -9.4
A. {(9, 8)} B. {(-9, -8)} C. {(-8, 9)} D. {(8, 9)}
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Evaluate the following:
1. 
2. 
3. 
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Solve the problem.A certain country's population P(t), in millions, t years after 1990 can be approximated by P(t) = 3.495(1.016)t .In what year did the country's population reach 4 million?
A. About 2009 B. About 1999 C. About 1989 D. About 2004
Mathematics
Use transformations to graph the function.y = cos x - 2
A. 
B. 
C. 
D. 
Mathematics