Use the Gauss-Jordan method to solve the system of equations. If the system has infinitely many solutions, let the last variable be the arbitrary variable.  4x - 5y - 7z = -1 -7x + 2y - 8z = 1 20x - 25y - 35z = -5

A. {(-1, 1, -5)}
B. ?
C. {(5, 5, -1)}
D. {(-5z + 2 , 4z- 25 , z)}

Answer: B

Mathematics

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A. y =  x3 - 4x -  + C
B. y =  x4 - 8x ln x+ Cx
C. y =  x4 - 4x2 - 4 + Cx
D. y = x4 - x2 - 4 + Cx

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Use the Rule of 78 to find the amount of unearned interest for the loan paid in full before the date of maturity.Finance charge: $332Total number of payments: 25Remaining number of payments, when paid in full: 4

A. $10.22 B. $11.07 C. $6.13 D. $6.64

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Find the GCD for the given numbers by an appropriate method.450, 1378, and 6750

A. 15 B. 2 C. 3 D. 6

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Find the root. If the root is not a real number, so state.

A. 6.233 B. not a real number C. 16 D. 4

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Mathematics