Solve the system using the inverse of the coefficient matrix of the equivalent matrix equation. 9x - y + 4z = 20 2x + 4y + 3z = 15 4x - 9y + z = -9
A. {(-2, 2, 4)}
B. ?
C. {(2, 1, 2)}
D. {(2, 2, 1)}
Answer: D
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Convert.540 seconds = minutes
A. 4 B. 9 C. 22 D. 16
Rotate the axes so that the new equation contains no xy-term. Discuss the new equation.24xy - 7y2 + 36 = 0
A. ? = 36.9°
- 
= 1
hyperbola
center at (0, 0)
transverse axis is the y'-axis
vertices at (0, ±3)
B. ? = 36.9°
- 
= 1
hyperbola
center at (0, 0)
transverse axis is the y'-axis
vertices at (0, ±2)
C. ? = 36.9°
- 
= 1
hyperbola
center at (0, 0)
transverse axis is the y'-axis
vertices at (0, ± 
)
D. ? = 53.1°
- 
= 1
hyperbola
center at (0, 0)
transverse axis is the y'-axis
vertices at (0, ±2)
Change the order of integration and evaluate the integral.
A. 90?
B. 
?
C. 
?
D. 
Find all local extreme values of the given function and identify each as a local maximum, local minimum, or saddle point.
A. 
saddle point; 
local maximum; 
local maximum; 
local minimum; 
saddle point; 
saddle point; 
local minimum; 
saddle point; 
saddle point
B. 
saddle point; 
local maximum; 
local minimum
C. 
local maximum; 
local maximum; 
local minimum; 
local minimum
D. 
saddle point; 
saddle point; 
saddle point; 
saddle point; 
saddle point