Solve using matrices. 6x - 5z + w = 24-x + 6y + z - 6w = 2 3x - y + 5w = 9 y - 6z - w = -11
A. (6, -1, 2, -2)
B. (-1, 6, 4, -3)
C. (5, 1, -2, 0)
D. (1, -1, -7, -2)
Answer: A
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Rationalize the denominator.
A. 
- 
B. 
C. 
D. 
Solve.The second angle of a triangular yard is 4 times as large as the first. The third angle is 90° greater than the first. How large are the angles?
A. First: 10°; second: 40°; third: 130° B. First: 15°; second: 60°; third: 105° C. First: 14°; second: 56°; third: 110° D. First: 10°; second: 40°; third: 100°
Use multiplication to check the answer. If an answer is incorrect, find the correct answer.
A. Incorrect; should be 980 B. Correct C. Incorrect; should be 979 R45 D. Incorrect; should be 979 R49
Factor the polynomial completely.9x2 - 27xy - 36y2
A. 9(x + y)(x - 4y) B. prime polynomial C. 9(x - y)(x + 4y) D. (9x - 9y)(x + 4y)