Find all complex roots. Write the answer in polar form, with 0 ? ? ? 360°.Cube roots of 5 + 5i
A. 
(cos 20° + i sin 20°), 
(cos 140° + i sin 140°), 
(cos 260° + i sin 260°)
B. 
(cos 20° + i sin 20°), 
(cos 140° + i sin 140°), 
(cos 260° + i sin 260°)
C. 
(cos 30° + i sin 30°), 
(cos 150° + i sin 150°), 
(cos 270° + i sin 270°)
D. 
(cos 20° + i sin 20°), 
(cos 140° + i sin 140°), 
(cos 260° + i sin 260°)
Answer: B
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Find the indicated cross product.v = 3i + 5j, w = 5i + 3kFind w × v.
A. -15j - 15k B. -15i + 9j + 25k C. -9i + 15j + 25k D. 25i + 15j - 15k
Solve the problem.How many 4-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, if repeated digits are not allowed and the first digit may not be a 0?
A. 23 B. 2401 C. 24 D. 720
Solve the problem.The current value of an annuity per period is given by P = 
- 
, where n is the number of periods, i is the interest rate, and R is the amount of the periodic payment. Find the limit of the current value equation as n approaches infinity to derive an expression for the current value for an annuity that makes payments in perpetuity.
A. P = ?
B. P = 
C. P = 0
D. P = 
- R
Solve. Write the answer in interval notation.
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