Add.(2r2s2 + 3r2s - 7rs) + (7r2s2 - 2r2s + 7rs - 4)
A. 9r2s2 + 5r2s - 14rs - 4
B. 9r2s2 + 5r2s + 14rs + 4
C. 9r2s2 + r2s - 4
D. 9r2s2 + r2s - 14rs - 4
Answer: C
Mathematics
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