Solve the system of four equations in four unknowns using matrices. -w + x + y + z = 7 w + x + y - z = 3 w + 2x + 3y + z = 19 3w - x + y + 2z = 16
A. (3, 4, 1, 5)
B. (4, 1, 3, 5)
C. (0, 4, 0, 1)
D. (1, 4, 5, 3)
Answer: A
Mathematics
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(3
- ?)
B. 
(2? + 3
)
C. 
(3
- ? + 6)
D. 
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A. no real solution
B. {(2, -2), (3, -3)}
C. 
D. 
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Solve the problem.A circular swimming pool, 20 feet in diameter, is enclosed by a circular deck that is 4 feet wide. What is the area of the deck? Use ? = 3.1416.
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Mathematics