shadowblackhear563 shadowblackhear563 13-02-2018 Mathematics contestada Find the sum of these polynomials. (x8 - x + 7) + (9x8 + 6) = A. 9x8 - x + 13 B. 9x16 - x + 13 C. 10x16 - x + 13 D. 10x8 - x + 13