Which polynomial represents the sum below?

(4x4 - x2 - x) + (x4 + x3 + x2 + x - 1)

A. 5x4 + 2x4 + 2x2 - 1

B. 5x4 + 2x4 - 1

C. 5x4 + x3 - 1

D. 5x4 + x4 + 2x2 - 1

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Round to the nearest hundred 7684

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