Add the polynomials.(3z2 + 6z + 9) + (z3 + 2z + 6)

A. 4z2 + 8z + 15
B. 4z3 + 8z + 15
C. z3 + 3z2 + 8z - 15
D. z3 + 3z2 + 8z + 15


Answer: D

Mathematics

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