Add.(-9x9 - 4x7 + 8x4 - 3) + (8x8 + 7x4 - 9x) + (-3x7 - 4x4 - 9x + 7)
A. -9x9 + 8x8 - 7x7 + 11x4 - 18x + 4
B. -x9 - x7 + 11x4 + 4
C. -9x9 + 8x8 - 7x7 + 15x4 + 4
D. -9x9 + 8x8 - x7 + 15x4 - 18x + 4
Answer: A
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