Use Gaussian elimination and matrices to solve the system of linear equations. Write your final augmented matrix in triangular form and then solve for each variable using back substitution. x + y + z= 3 x - y + 2z= 54x + y + z=-3
A. (-2, 1, 4)
B. (4, 1, -2)
C. (4, -2, 1)
D. (-2, 4, 1)
Answer: A
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A. 10 B. 6 C. 8 D. 20
How many grams of pure antiseptic are needed to make 2L of a 2% solution.
A. 0.4g B. 40g C. 400g D. 0.04g
Find parametric equations for the line described below.The line through the point P(-4, 0, 7) and parallel to the line x = 4t + 7, 
A. x = -4, y = 4t, z = -3t + 7 B. x = 4 + 4, y = 3t, z = 4t - 7 C. x = 3t - 4, y = -4t, z = 7 D. x = 4t - 4, y = 3t, z = 4t + 7
Find the indicated term of the sequence.The eighth term of the arithmetic sequence whose first term is -3 and whose common difference is -2
A. -17 B. 11 C. 13 D. -19