Solve the problem.A twin-engined aircraft can fly 960 miles from city A to city B in 4 hours with the wind and make the return trip in 6 hours against the wind. What is the speed of the wind?
A. 20 mph
B. 80 mph
C. 40 mph
D. 60 mph
Answer: C
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Evaluate the expression.(2932)
A. 85,556
B. 291
C. 42,778
D. 
Use De Moivre's Theorem to find the indicated power of the complex number. Write your answer in standard form a + bi.(cos 26° + i sin 26°)5
A. -3.21 + 3.83i B. 0.12 C. -0.64 + 0.77i D. 0.12i
Solve the problem.At a single ticket booth, customers arrive randomly at a rate of x per hour. The average line length is given by 
where 
To keep the wait in line reasonable, it is required that the average line length should not exceed 6 customers. Determine the range of rates at which customers can arrive before a second attendant is needed. Express your answer in interval form.
A. [0, 18] B. [0, 16] C. [0, 19) D. [0, 17]
Find the determinant.det 
A. 3 B. -9 C. 9 D. 11