Solve the system using the inverse matrix method.
A. x = 2, y = 0, z = 1; (2, 0, 1)
B. x = -12, y = 38, z = -21; (-12, 38, -21)
C. x = 1, y = 20, z = -16; (1, 20, -16)
D. x = 14, y = 44, z = 25; (14, 44, 25)
Answer: B
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Find the foci and endpoints of each axis for the given ellipse.4x2 + 16y2 = 64
A. Foci: (± 4, 0); vertices: (±2
, 0);
endpoints of the minor axis: (± 2, 0)
B. Foci: (0, ±2
); vertices: (0 , ± 4);
endpoints of the minor axis: (± 2, 0)
C. Foci: (± 12, 0); vertices: (± 16, 0);
endpoints of the minor axis: (0, ± 4)
D. Foci: (±2
, 0); vertices: (± 4, 0);
endpoints of the minor axis: (0, ± 2)
Find the nth term an of the geometric sequence.2, 
, 
, 
, 
, . . .
A. an = (2)
n
B. an = (2)
n-1
C. an = (2)
n+1
D. an = (2)
n-1
Evaluate the polynomial.x2 + 2y2 - 3xy for x = 2 and y = 6
A. 40 B. 112 C. 4 D. 76
Transform the polar equation to an equation in rectangular coordinates. Then identify and graph the equation.r sec ? = -6 
A. 
x = -6; vertical line 6 units
to the left of the pole
B. 
(x + 3)2 + y2 = 9; circle, radius 3
center (-3, 0) in rectangular coordinates
C. 
y = -6; horizontal line 6 units
below the pole
D. 
x2 + (y + 3)2 = 9; circle, radius 3,
center at (0, -3) in rectangular coordinates