Find the sum or difference.(2x7 + 6x9 - 7 - 7x8) - (2 - 2x8 + 3x9 - 7x7)

A. 3x9 - 9x8 - 5x7 - 5
B. 3x9 - 5x8 + 9x7 - 9
C. 9x9 - 9x8 - 5x7 - 5
D. 9x9 - 9x8 - 5x7 - 9

Answer: B

Mathematics

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A. 15 B. 14 C. 16 D. 12

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Solve the system of equations.5x - 8y + 5z = -56-15x + 24y - 15z = 16815x - 24y + 15z = -168

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Write the percent as a fraction or mixed number in lowest terms.222%

A. 2 
B. 1 
C. 22
D. 4 

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