Simplify by first converting to rational exponents. Assume all variables represent positive real numbers. Give the answer in radical form.
A. 81
B. 9
C. 243
D. 
Answer: A
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Use a calculator to verify the value found by using the double-angle formulas.Find sin 
directly and by using functions of 
.
A. 1.1756 B. 0.9511 C. 0.309 D. 0.5878
Simplify.240 ÷ 5 - 2
A. 46 B. 237 C. 80 D. 233
Solve using elimination.
A. x = 4, y = 2; x = 2, y = 4; x = -4, y = -2; x = -2, y = -4 or (4, 2), (2, 4), (-4, -2), (-2, -4) B. x = -4, y = -2; x = -2, y = -4 or (-4, -2), (-2, -4) C. x = 4, y = -2; x = 4, y = 2 or (4, -2), (4, 2) D. x = 4, y = 2; x = -4, y = 2 ; x = 4, y = -2; x = -4, y = -2 or (4, 2), (-4, 2), (4, -2), (-4, -2)
Find the indicated roots. Write the answer in trigonometric form.Fourth roots of 16(cos 280° + i sin 280°)
A. 2(cos 70° + i sin 70°), 2(cos 160° + i sin 160°), 2(cos 250° + i sin 250°), 2(cos 340° + i sin 340°) B. 2(cos 140° + i sin 140°), 2(cos 230° + i sin 230°), 2(cos 320° + i sin 320°), 2(cos 50° + i sin 50°) C. 2(cos 70° + i sin 70°), 2(cos 160° + i sin 160°), 2(cos 320° + i sin 320°), 2(cos 50° + i sin 50°) D. 2(cos 280° + i sin 280°), 2(cos 370° + i sin 370°), 2(cos 460° + i sin 460°), 2(cos 190° + i sin 190°)