Add or subtract. Assume all variables represent nonnegative real numbers. - 

A. 3 - 4
B. 3 - 4
C. 4 - 3
D. 7

Answer: A

Mathematics

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Solve using matrices.5x + y - 5z + w = -21-x + 5y + z - 5w = 233x - y + 5z + 5w = 15  x + y - 5z - w = -23

A. (-1, 2, 7, 1) B. (-5, 3, -1, 6) C. (3, -2, 0, 5) D. (-3, -6, 12, 5)

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Provide an appropriate response.3 × 10-2 = .

A. 0.03 B. 0.003 C. 300 D. 30

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Solve the matrix equation for X.A = , B = , AX = B

A.

B.

C.

D.

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