Add using columns.Add 9y5 - 7y4 - 5y and 7y5- 5y4 - 7y.

A. 16y - 12y5 - 12y4
B. 2y5 + 4y4 - 14y
C. 16y5 - 12y4 - 12y
D. -8y10


Answer: C

Mathematics

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