Solve the system of equations by Gauss-Jordan elimination.

A. {(18, 12, -6)}
B. {(12, 6, 0)}
C. {(9, 3, 3)}
D. ?


Answer: C

Mathematics

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Write the fraction in lowest terms.

A.  
B.  
C.
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An glass of wine has a pH of 4.75. Find the hydrogen ion concentration of this solution.

A. 4.75 mol/L [H+] B. 5.62 × 10-10 mol/L [H+] C. 1.78 × 10-5 mol/L [H+] D. 1.78 mol/L [H+]

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Find the center of the hyperbola. 16(x + 1)2 - 25(y - 2)2 = 400

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Solve the equation.8x - 4x + 3x = 28

A.
B.
C. 21
D. 4

Mathematics