Answer:
-27n + 108.
Explanation:
an = -27n + 108.
The first term a1 = 81 and the common difference d = 54-81 = -27 . (Also 27 - 54 = -27 and 0 - 27 = -27).
The explicit formula is
an = a1 + d(n - 1)
= 81 - 27(n - 1)
= -27n + 81 + 27
= -27n + 108.
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