Verified Answer :

\(Subtitute\ the\ values\ of\ x=-9.1\\and\ y=5.6\ to\ the\ expression\ x+y:\\\\x+y=-9.1+5.6\\---------\\use\ commutative\ property:a+b=b+a\\\----------\\\\=5.6+(-9.1)=5.6-9.1=\huge\boxed{-3.5}\)

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