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 piece of machinery valued at $38,000 depreciates at a rate of 7% yearly. How long will it take until it has a value of $19,000? Please round the answer to the nearest tenth.
A. 11.9 years B. 14.9 years C. 12.9 years D. 9.9 years E. 8.9 years
Mathematics
Solve the initial value problem.
= - 
cos 
?, r(0) = -5
A. r = -sin 
? - 5
B. r = - 
sin 
? - 5
C. r = sin 
? - 5
D. r = cos 
? - 6
Mathematics
Solve the equation.-7.6q + 1.4 = -41.3 - 1.5q
A. -49 B. 5.6 C. 5.8 D. 7
Mathematics
Decide whether or not the points are the vertices of a right triangle.(2, -5), (8, -3), (14, -10)
A. Yes B. No
Mathematics