Let Y=x+4. Compute rY(t) in terms of rX is the answer just r 3X+4 (t) ?
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you mean y = 3x+4 then ry(t) = E(t^y) so E(t^y) = E(t^3x+4) =E(t^3x * t^4) =t^4 + E(t^3x) =t^4 + rx(t^3)
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