Add or subtract as indicated. Express the answer as a single polynomial in standard form.(7x7 - 9x4 + 4) - (9x4 + 2x7 + 20)

A. 5x7 - 18x4 - 16
B. 5x7 - 18x4 + 24
C. -29x11
D. 5x7 - 7x4 + 24

Answer: A

Mathematics

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