Write the system of linear equations that the augmented matrix represents. Use the variables x, y, and z.
A. 14x + 9y = 20
9x + 3y = 20
B. 9x + 14y = 20
3x + 9y = 20
C. 14x + 9y = 20
3x + 9y = 20
D. 14x + 9y = -20
3x + 9y = -20
Answer: C
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A. 
B. 
C. 
D. 
Use a computer algebra system (CAS) to solve the given initial value problem.y' = 
, y(0) = 4
A. y = 8 tan-1 x - 4x
B. y = 4 ln
- 4x + 4
C. y = 5 tan-1 x - x + 4
D. y = 8 tan-1 x - 4x + 4
Express the repeated multiplication in exponential notation.4 ? 4 ? 4
A. 41 B. 34 C. 3 ? 4 D. 43
Refer to the circle graph to solve the problem.Time Required to Install Carpeting in a House (Work Shift = 8 hours) 
In which activity was the least amount of time spent? How many hours did this activity take?
A. Installing new carpet; 3 hours
B. Cleaning up; 
hour
C. Removing old carpet; 
hour
D. Moving furniture; 
hours