Find all cube roots of the complex number. Leave answers in trigonometric form.2 + 2i
A. 
cis 20°, 
cis 140°, 
cis 260°
B. 
cis 20°, 
cis 140°, 
cis 260°
C. 
cis 30°, 
cis 150°, 
cis 270°
D. 
cis 20°, 
cis 140°, 
cis 260°
Answer: D
Mathematics
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A. 
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B.
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C.
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D.
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Solve the exponential equation using the method of "relating the bases" by first rewriting the equation in the form 
= 
A. 
B. 
C. 
D. 
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Solve the problem.The voltage E in an electrical circuit is given by E = 6.4 cos 110?t, where t is time measured in seconds. Find the period.
A. 
B. 55
C. 
D. 55?
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A. constant B. increasing C. decreasing
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