Find all cube roots of the complex number. Leave answers in trigonometric form.-3
+ 3i
A. 
cis 50°, 
cis 170°, 
cis 290°
B. 
cis 70°, 
cis 190°, 
cis 310°
C. 
cis 70°, 
cis 190°, 
cis 310°
D. 
cis 50°, 
cis 170°, 
cis 270°
Answer: A
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Compute the gradient of the function at the given point.
A. ?f = 
j - 
k
B. ?f = - 
j - 
k
C. ?f = - 
j + 
k
D. ?f = - 
j - 
k
Use identities to find the exact value of the trigonometric function.Find cos ?, given that sin ? = 
and ? is in quadrant II.
A. - 
B. 
C. - 
D. 
The bar graph shows the percentages of health clubs in a large city that offer the service listed on the left. Use the graph to answer the question. 
Estimate the percentage of health clubs in this city that offer body fat testing.
A. 4% B. 11% C. 8% D. 14%
Find each product. Write the result in the form a + bi.(3 + 9i)(3 - 8i)
A. -72i2 + 3i + 9 B. -63 + 51i C. 81 - 3i D. 81 + 3i