Combine terms.z3 + 12z4 + 5z2 + z4 - 9z3

A. 13z4 - 8z3 + 5z2
B. -13z4 + 10z3 - 5z2
C. 12z4 - z3 + 5z2
D. 13z8 - 10z6 + 5z2

Answer: A

Mathematics

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