Solve the equation.9 = b - 12
A. {-3}
B. {3}
C. {-21}
D. {21}
Answer: D
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Solve the system by inspecting the graph of the equations.x + 4y = 04x - 4y = -20
A. ?
B. 
C. 
D. 
Solve the problem.The table below gives the median annual incomes for men and women in three cities in 2001. Assume that in 2002, the median annual incomes increased by 7% in all categories. Create a matrix that represents the median annual incomes for 2002. Round numbers to the nearest dollar. 
A. 
B. 
C. 
D. 
Answer the question.Determine if 106,131 is divisible 2, 3, 5.
A. 2, 3 only B. 2 only C. 3 only D. 2, 3, 5
Solve the problem.Roberto invested some money at 7%, and then invested $3000 more than twice this amount at 12%. His total annual income from the two investments was $4390. How much was invested at 12%?
A. $26,000 B. $29,000 C. $2900 D. $9000