Verified Answer :

olemakpadu

s(x) = 2 - x²

t(x) = 3x

s(t(x)) = st(x)

s(t(x)) :

s(3x)

So in s(x) = 2 - x²,  to solve for s(3x) we replace x with 3x

s(x) = 2 - x²

s(3x) = 2 - (3x)²

          =  2 - 9x²

st(x) = 2 - 9x²

st(-7) = 2 - 9(-7)(-7)

         = 2 - 949 = 2 - 441 = -439

st(-7) = -439

Answer: A on edge

Step-by-step explanation:

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