Write a matrix equation equivalent to the system of equations. x + y + z = -4 4x - 4y - 3z = -4-4x - 3y - 2z = 4
A. 
=
B. 
= 
C. 
=
D. 
= 
Answer: A
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Factor out the greatest common factor. Simplify the factors, if possible.5x3 + 20x
A. 5x(x2 + 15x) B. 5x(x2 + 4x) C. 5x2(x + 4) D. 5x(x2 + 4)
Solve the problem.In the first two weeks of school, Jill studied 10 hours and 16 hours, respectively. How many hours must she study during the third week to give her an average of 20 hours per week?
A. 23 hours B. 34 hours C. 20 hours D. 13 hours
Answer the question.How can the graph of f(x) = -3x3 + 2 be obtained from the graph of 
A. Stretch it horizontally by a factor of -3. Reflect it across the x-axis. Shift it vertically 2 units downward. B. Stretch it vertically by a factor of 3. Reflect it across the x-axis. Shift it vertically 2 units upward. C. Stretch it horizontally by a factor of 2. Reflect it across the x-axis. Shift it vertically 3 units upward. D. Stretch it vertically by a factor of 3. Reflect it across the y-axis. Shift it vertically 2 units upward.
Calculate the Riemann Sum for the integral using n = 5.
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Give the answer correct to two decimal places.
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A. 0.33 B. 0.81 C. 0.68 D. 0.65 E. 0.53