Verify that the matrix is invertible and find its inverse.A = 
A. A-1 = 
B. A-1 = 
C. A-1 = 
D. A-1 does not exist.
Answer: B
Mathematics
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Solve the system.2x + y = 12x - z = 6y + z = -5
A. Infinitely many solutions B. No solution C. (6, -5, 0) D. (0, 1, -6)
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Find the reference angle for the given angle.129°
A. 39° B. 61° C. 51° D. 49°
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Write the number as a product of a real number and i. Simplify the radical expression.
A. 3
B. -3
C. 3i
D. -3i
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Find the distance between P and Q and the coordinates of the midpoint of the segment joining P and Q.
A. 
; 
B. 
; 
C. 
; 
D. 
; 
Mathematics