Add or subtract as indicated.(12x2 - xy - y2) + (x2 + 8xy + 8y2)
A. 11x2 - 9xy - 9y2
B. 13x2 + 9xy + 9y2
C. 13x2 + 7xy + 7y2
D. 12x2 + 8xy + 8y2
Answer: C
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A. 
B. 
C. 
D. 
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Fill in the blank(s) with the appropriate word(s).
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assembly. If 
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