Find all cube roots of the complex number. Leave answers in trigonometric form.125
A. 5 cis 90°, 5 cis 210°, 5 cis 330°
B. 5 cis 0°, 5 cis 60°, 5 cis 120°
C. 5 cis 45°, 5 cis 165°, 5 cis 325°
D. 5 cis 0°, 5 cis 120°, 5 cis 240°
Answer: D
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Solve.Mark the electrician charges $80 for a house call, and then $35 per hour for labor. Sara the electrician charges $65 for a house call, and then $45 per hour for labor. Graph the system to find the number of hours of electrical work that would be required for the two electricians to charge the same amount.
A. 1.5 hrs B. 2 hrs C. 1 hrs D. 0.5 hrs
Solve the right triangle shown in the figure. 
= 1.9 m, ?B = 43.5°, ?C = 90°
A. ?A = 46.5°, 
= 3.2 m, 
= 3.7 m
B. ?A = 46.5°, 
= 3.2 m, 
= 2.6 m
C. ?A = 46.5°, 
= 0.7 m, 
= 2.0 m
D. ?A = 46.5°, 
= 1.8 m, 
= 2.6 m
Decide whether the given functions are inverses.f = {(3, 10), (4, 12), (5, 14), (6, 16), (7, 18)}g = {(10, 3), (12, 4), (14, 5), (16, 6), (18, 7)}
A. No B. Yes
Complete the identity.(sin x + cos x)2 = ?
A. sin 2x B. 1 + cos 2x C. 1 + sin 2x D. 1 - cos 2x