Combine the complex numbers.(2 + 
) + (5 - 
)
A. 7 + 6
i
B. 7 - 6
i
C. 7 + 6
D. 7 - 6
Answer: B
Mathematics
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Find the series' radius of convergence.
A. 0 B. 9 C. 18 D. ?, for all x
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Solve the problem.Find the centroid of the rectangular solid defined by 
, 
, 
.
A. 
= 1, 
= 
, 
= 
B. 
= 2,
= 
, 
= 
C. 
= 
, 
= 3, 
= 
D. 
= 4, 
= 9, 
= 5
Mathematics
Use a special product formula to simplify.(10a - 7)2
A. 100a2 - 140a + 49 B. 100a2 + 49 C. 10a2 + 49 D. 10a2 - 140a + 49
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Find all solutions of the equation in the interval [0, 2?).sec 
= 
A. 
B. 
C. 
D. 
Mathematics