Perform the indicated operations and express your answer in the form a + bi. 
A. ±3
B. 3i
C. -i
D. -3i
Answer: B
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Solve the system by the substitution method. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(8, 7)} B. {(8, 6)} C. {(7, 7)} D. no solution; ?
Use Gaussian elimination to find the complete solution to the system of equations, or state that none exists. x + y + z + w = 8 3x + 2y + z + 4w = 214x + 4y + 5z + 8w = 302x + 3y + 6z + 9w = 15
A. {(5w + 11, -3w - 7, -3w + 4, w)} B. ? C. {(-6w + 3, 9w + 7, -4w - 2, w)} D. {(-3, 16, -6, 1)}
Solve the problem.Each week a soft drink machine sells x cans of soda for $0.75/soda. The cost to the owner of the soda machine for each soda is $0.10. The weekly fixed cost for maintaining the soda machine is $25/week. Write an equation that relates the weekly profit, P, in dollars to the number of cans sold each week. Then use the equation to find the weekly profit when 92 cans of soda are sold in a week.
What will be an ideal response?
Graph.y ? 
A. 
B. 
C. 
D. 