Find the sum or difference.2(-2r4 + 9r3 - 3r) - 3(8r4 - 9r3 + 6r2 - 2r)
A. -28r4 + 18r3 - 6r2 - r
B. -28r4 + 6r2 - 5r
C. -28r4 - 9r3 + 18r2 - 12r
D. -28r4 + 45r3 -18r2
Answer: D
Mathematics
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A. ?
B. 
C. 
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E. 
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