Write the system of equations that corresponds to the augmented matrix.
A. x = 6
y = -4
z = -6
B. x = 0
y = 0
z = 0
C. x = 12
y = -8
z = -12
D. x = -6
y = 4
z = 4
Answer: A
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Solve the problem.A pendulum of length L, when displaced horizontally and released, oscillates with harmonic motion according to the equation y = A sin((
)t + ?/2), where y is the distance in meters from the rest position t seconds after release, and g = 9.8 m/sec2. Identify the period, amplitude, and phase shift when A = 0.39 m and 
Round all answers to the nearest hundredth.
A. 1.41 sec, 0.39 m, -0.35 units to the left B. 0.70 sec, 0.39 m, -0.70 units to the left C. 1.41 sec, 0.39 m, 0.35 units to the right D. 0.31 sec, 0.39 m, -0.079 units to the left
Solve the system of equations by the elimination method.9x + 9y = 18-3x - 4y = -8
A. (0, 2) B. no solution C. (-1, 3) D. (0, 3)
Write the whole number in word form.128,615
A. Six hundred fifteen thousand, one hundred twenty-eight B. One hundred twenty-eight thousand, six hundred fifteen C. One hundred twenty thousand, eighty-six hundred, fifteen D. One hundred twenty-eight million, six hundred fifteen
Solve.4x - 7 = 9 + 9x
A. - 
B. - 
C. 
D. - 