Solve the system using Gauss-Jordan elimination.
?
?
A. 
?
B.
?
C.
?
D.
?
E.
?
Answer: D
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Solve the problem.Mr. Lee wanted to keep track of how far he was driving today. He drove to Lodi which was 
, then he drove to Merced which was 
, then he drove home which was 
. How far did Mr. Lee drive?
A. 66.40 mi B. 65.40 mi C. 65.41 mi D. 66.41 mi
Solve. Round your answer up to the next whole number, if necessary.The MetroCity electric company is planning to produce a new lamp. For the first year, the fixed costs for setting up production are $21,000. The variable costs for producing each lamp are $19. The revenue for each lamp is $25. Find the number of lamps that are sold at the break-even point.
A. 3500 lamps B. 3505 lamps C. 3501 lamps D. 3498 lamps
Find the exact value of the expression.
A. 
B. 
C. - 
D. - 
Solve the double inequality.-13 < -3a + 5 and -3a + 5 ? -1
A. -6 < a ? -2 B. 2 < a ? 6 C. 2 ? a < 6 D. -6 ? a < -2