Find 
. Express the answer in standard form.z1 = 2(cos 120° + i sin 120°)z2 = 4(cos 60° + i sin 60°)
A. 
- 
i
B. 
+ 
i
C. 
+ 
i
D. 
- 
i
Answer: B
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A point on the terminal side of angle ? is given. Find the exact value of the indicated trigonometric function of ?.(21, 28) Find cos ?.
A. 
B. 
C. 
D. 
Plot the ordered pair in the Cartesian plane, and state in which quadrant or on which axis it lies.(5, 1)
A. Quadrant IV
B. Quadrant I
C. Quadrant I
D. Quadrant II
Solve.One box of muffin mix weighs 2.245 kg, but 89 grams of this weight is the packaging. Find the actual weight of the muffin mix in 4 boxes.
A. 5.42 kg B. 8.98 kg C. 2.156 kg D. 8.624 kg
Solve.In September, Karen's credit card bill was $178.90. In October, her credit card bill was $217.98. What is the difference in cost between her October bill and her September bill?
A. $29.08 B. $40.08 C. $39.18 D. $39.08