Find all cube roots of the complex number. Leave answers in trigonometric form.125i
A. 5 cis 30°, 5 cis 150°, 5 cis 270°
B. 5 cis 60°, 5 cis 180°, 5 cis 300°
C. 1, -1, -i
D. 5 cis 0°, 5 cis 120°, 5 cis 240°
Answer: A
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Solve the problem.How can $42,000 be invested, part at 4% annual interest and the remainder at 10% annual interest, so that the interest earned by the two accounts is equal at the end of the year?
A. $30,000 invested at 4%; $12,000 invested at 10% B. $22,000 invested at 4%; $20,000 invested at 10% C. $12,000 invested at 4%; $30,000 invested at 10% D. $20,000 invested at 4%; $22,000 invested at 10%
?A population of bacteria is introduced into a culture. The number of bacteria P can be modeled by 
where t is the time (in hours). Find the rate of change of the population when 
.
?
A. 21.95 bacteria/hr B. ?3.53 bacteria/hr C. ?10.6 bacteria/hr D. ?2.07 bacteria/hr E. ?7.32 bacteria/hr
Find the vertices and the foci of the given ellipse.
+ 
= 1
A. V: (0, -10), (0, 10); F: (-6, 0), (6, 0) B. V: (0, -10), (0, 10); F: (0, -8), (0, 8) C. V: (-10, 0), (10, 0); F: (-8, 0), (8, 0) D. V: (-10, 0), (10, 0); F: (0, -6), (0, 6)
Determine whether f is continuous at c.f(x) = 
;c = 0
A. continuous B. not continuous