Write an equation that models the sequence 400, 200, 100, 50, ...

A) y = 400 (2^x)

B) y = 50 (2^x)

C) y = 1/2x + 400

D) y = 400 (1/2) ^x-1

What is the next term in the sequence? 1/2,2/6,3/18,4/54

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