The first five terms in a pattern are shown below. -0.5, -0.25, 0, 0.25, 0.5, ... If the pattern continues, which expression can be used to find the nth term?
O 0.75n - 1.25 0 -0.25n - 0.25 O 0.25n - 0.75 -0.5n + 0.25

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