Add and write the resulting polynomial in descending order of degree.(7x8 + 3x7 - 8x6 + 8) + (9x8 + 6x7 - 5x6 - 4)
A. 16x8 + 9x7 + 13x6 + 4
B. 16x8 - 9x7 + 13x6 + 4
C. 16x8 + 9x7 - 13x6 + 4
D. 16x8 - 9x7 - 13x6 + 4
Answer: C
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