Find sum of the pair of complex numbers.-8 + 9i, 12
A. -20 + 9i
B. -20 + 21i
C. 4 + 9i
D. 4 + 21i
Answer: C
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Perform the indicated operations graphically.-3 - (2 + 2j )
A. 
a = -3
b = -2 - 2j
c = -3 - (2 + 2j )
B. 
a = -3
b = -2 - 2j
c = -3 - (2 + 2j )
C. 
a = -3
b = -2 - 2j
c = -3 - (2 + 2j )
D. 
a = 3
b = -2 - 2j
c = -3 - (2 + 2j )
Solve the problem.A guitar string is plucked so that it vibrates with a frequency of 
Suppose the maximum displacement at the center of the string is 
Find an equation of the form 
to model this displacement. Round constants to 2 decimal places.
A. s(t) = 1.16 cos 10.50t B. s(t) = 1.16 cos 414.69t C. s(t) = 0.58 cos 10.50t D. s(t) = 0.58 cos 414.69t
Rewrite the rational expression with the indicated denominator.
= 
A. 
B. 
C. 
D. 
Solve.2x2 - 16x + 30 = 0
A. 2, 3, 5 B. 3, 5 C. -3, -5 D. 0, 3, 5