Find the absolute value of the complex number.2 - i
A. 
B. 3
C. 5
D. 
Answer: D
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Solve the problem.Find the center of mass of the region of constant density bounded by the paraboloid 
and the xy-plane.
A. 
= 0, 
= 0, 
= 50
B. 
= 0, 
= 0, 
= 
C. 
= 0, 
= 0, 
= 5
D. 
= 0, 
= 0, 
= 
A right triangle with acute angle ? is given. Evaluate the indicated trigonometric function of the acute angle ?.Find csc ?.
A. 
B. 
C. 
D. 
Solve the system by graphing. If there is no solution or an infinite number of solutions, so state. Use set notation to express the solution set.
A. {(1, 1)}
B. {(1, 5)}
C. infinitely many solutions; {
y + x = 6} or {
x = -y}
D. no solution; ?
Find all cube roots of the complex number. Leave answers in trigonometric form.2 + 2i
A. 
cis 20°, 
cis 140°, 
cis 260°
B. 
cis 20°, 
cis 140°, 
cis 260°
C. 
cis 30°, 
cis 150°, 
cis 270°
D. 
cis 20°, 
cis 140°, 
cis 260°