Simplify. Write your answer in the form a + bi, where a and b are real numbers.(7 - 2i) + (2 + 8i)
A. -9 - 6i
B. 9 - 6i
C. -9 + 6i
D. 9 + 6i
Answer: D
Mathematics
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A. 9.1% B. 910% C. 91% D. 0.091%
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Find an equation of a line satisfying the following conditions.Parallel to x = 1, passing through 
A. y = 2
B. x = 
C. y = - 
D. x = - 
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Find the reference angle of the given angle.- 
A. 
B. 
C. 
D. 
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Find the center and radius of the sphere.
A. center: (3, -6, -3); radius: 25 B. center: (-3, 6, 3); radius: 5 C. center: (3, -6, -3); radius: 25 D. center: (-3, -6, -3); radius: 5 E. center: (3, -6, -3); radius: 5
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