Answer:
addition property
Step-by-step explanation:
See attached image.
28
f(n)=34, f(n-6)=34-6
=28
1. no like terms
2. x^ 3 − x^ 2 − x + 1
3.x y + x + y + 1
4.x^ 3 + x^ 2 y + x y^ 2 + y^ 3
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