Two ships leave the same port at noon. Ship A sails north at 21 mph, and ship B sails east at 12 mph. How fast is the distance between them changing at 1 p.m.?
?
A. 
mph
B. 
mph
C. 
mph
D. 32 mph
E. 24 mph
Answer: C
Mathematics
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A. -73 B. 63 C. -90 D. -63
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Simplify. Assume that variables can represent any real number.
A. -10b3
B. -10b
C. -10
D. Not a real number
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Find all cube roots of the complex number. Leave answers in trigonometric form.125i
A. 1, -1, -i B. 5 cis 60°, 5 cis 180°, 5 cis 300° C. 5 cis 0°, 5 cis 120°, 5 cis 240° D. 5 cis 30°, 5 cis 150°, 5 cis 270°
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