Which polynomial contains the powers in descending order?

A. - 2x^2+1+3x^4-x^3+4x^5

B. 1-2x^2-x^3+4x^5+3x^4

C. 3x^4-x^3+4x^5-2x^2+1

D. 4x^5 + 3x^4-x^3-2x^2 + 1

Simplify: 2 (x-5) - 1/2 (12x + 12) =

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