Write the system of linear equations represented by the augmented matrix. Use x, y, z, and, if necessary, w for the variables. Then use back-substitution to find the solution.
A. {(-17, -7, -9)}
B. {(-397, 75, -8)}
C. {(-473, -69, -8)}
D. {(-3, 3, -8)}
Answer: B
Mathematics
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Use the problem-solving strategy for applications of linear equations to solve the application problem.Tom Quig traveled 200 miles east of St. Louis. For most of the trip he averaged 70 mph, but for one period of time he was slowed to 10 mph due to a major accident. If the total time of travel was 8 hours, how many miles did he drive at the reduced speed?
A. 70 mi B. 80 mi C. 60 mi D. 55 mi
Mathematics
Find the indicated partial sum for the sequence.- 
, 
, - 
, 
, ...; S6
A. - 
B. - 
C. - 
D. 
Mathematics
Divide.
A. 9.7 B. 1.97 C. 0.97 D. 19.7
Mathematics
Perform the indicated operation.(-3n3)(6n4)
A. 3n7 B. -18n7 C. 3n12 D. -18n12
Mathematics