Write the system of equations associated with the augmented matrix.
A. x = 0
y = 4
z = -3
B. x = -5
y = 9
z = 2
C. x = -7
y = 7
z = 0
D. x = 5
y = -9
z = -2
Answer: B
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Fill in the blank(s) with the appropriate word(s).
Perform the indicated operation. Write the result in the form a + bi.
? 
A. -
B. i
C. 
D. -i
Solve the problem.Peter must practice the piano 13
hours per week. He has already practiced 7
hours. How many more hours does he need to practice?
A. 4
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B. 5 hours
C. 6
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Find the mean, median, mode, and midrange for the given data. Round to the nearest tenth if necessary.
A. mean = 23.2, median = 22.4, mode = 22.4, midrange = 24.15 B. mean = 23.2, median = 22.4, mode = 22.4, midrange = 6.7 C. mean = 23.2, median = 24.8, mode = 22.4, midrange = 24.15 D. mean = 23.7, median = 22.4, mode = 27.5, midrange = 6.7