Solve the system using the inverse of the coefficient matrix of the equivalent matrix equation. 9x + 9y - z = 124 x + 4y - 6z = 23 6x + y + z = 51

A. (7, 2, 7)
B. (7, 7, 2)
C. (-7, 7, 14)
D. No solution

Answer: B

Mathematics

Multiply.(x - 12)(x2 + 4x - 6)

A. x3 + 16x2 + 42x - 72 B. x3 - 8x2 - 54x + 72 C. x3 + 16x2 + 54x + 72 D. x3 - 8x2 - 42x - 72

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Mathematics

Express the product as a sum or difference.cos 3x cos 2x

A. (cos 5x - cos x)
B. cos² 6x²
C. (cos x + cos 5x)
D. (cos 5x - sin x)

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Mathematics

Estimate by using front-end rounding.

A. 12,950 B. 13,740 C. 13,730 D. 13,731

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Mathematics

Find the absolute value.

A. 38 B. 19 C. 0 D. -19

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Mathematics