Identify the pairs of complementary or supplementary angles, as indicated.Supplementary
A. ?AOC & ?AOD; ?AOD & ?DOB
B. ?COB & ?BOD; ?BOD & ?AOD
C. ?AOD & ?COB; ?AOC & ?DOB
D. ?AOC & ?AOD; ?AOD & ?DOB; ?DOB & ?COB; ?COB & ?AOC
Answer: D
Mathematics
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Perform the indicated operation. Express your answer in simplest form.
- 
A. 
B. 
C. 
D. 
Mathematics
Write the conjugate 
of the complex number z. Then find z
.z = 1 - 9i
A. 
= 1 + 9i, z
= 82
B. 
= 1 + 9i, z
= -80
C. 
= 1 + 9i, z
= 1 - 81i
D. 
= 1 + 9i, z
= 1 - 81i2
Mathematics
Find the indicated vector.Let u = 
. Find 2u.
A. 
B. 
C. 
D. 
Mathematics
Solve the system of equations using matrices.4x - 15y = -8-16x + 9y = -2
A. 
B. 
C. 
D. 
Mathematics