D (S-1)(x) = (x + ¹)(x) = (S-1)(-1) = Suppose that the functions s and I are defined for all real numbers x as follows. s(x)=2x-4 t(x)=x+4 Write the expressions for (st) (x) and (s+t) (x) and evaluate (s-t) (-1). X 5 7 ?

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Q: %

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A: In general,  x,y→x+a, y+b