Use Cramer's rule to solve the system. 3x - 2y + 2z - w = 2 4x + y + z + 6w = 8-3x + 2y - 2z + w = 5 5x + 3z - 2w = 1
A. 
B. 
C. 
D. Can't use Cramer's rule, D = 0
Answer: D
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Suppose that ln 2 = a and ln 5 = b. Use properties of logarithms to write each logarithm in terms of a and b.ln 
A. 
B. b - a
C. 
D. a + b
Solve.The president of a certain university receives a salary three times the salary of one of the department heads. The total of the two salaries is $180,000. Determine the salaries.
A. president's salary = $13,500; department head's salary = $4500 B. president's salary = $90,000; department head's salary = $45,000 C. president's salary = $135,000; department head's salary = $45,000 D. president's salary = $45,000; department head's salary = $135,000
Complete.278 ft = 
m (Round to the nearest tenth.)
A. 84.2 B. 834 C. 92.7 D. 308.9
Perform the indicated operations.(4a5 + 5a3) + (2a5 + 7a3)
A. 18a8 B. 18a16 C. 6a5 + 12a3 D. 6a10 + 12a6