Solve the system using matrices. If there is no solution or if there are infinitely many solutions and a system's equations are dependent, so state.
A. {(1, -2, 2)}
B. infinitely many solutions; dependent equations
C. no solution or ?
D. {(2, -2, 1)}
Answer: D
Mathematics
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?
?
A. 
B. ?
C. ?
D. ?
E. ?
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Solve the problem.The polynomial function 
represents the yearly income (or loss) from a real estate investment, where t is time in years. After how many years does income begin to decline?
A. 6 yr B. 12 yr C. 8 yr D. 5 yr
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Graph the system of inequalities.x + 2y ? 2x + y ? 0
A. 
B. 
C. 
D. 
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Use a calculator to give the value in degrees.sin-1(0.2079)
A. 12° B. 14° C. 15° D. 10°
Mathematics