![\bf 81~~,~~\stackrel{81-27}{54}~~,~~\stackrel{54-27}{27}~~,~~\stackrel{27-27}{0}~~,~...\qquad \qquad \stackrel{\textit{common difference}}{d = -27} \\\\[-0.35em] ~\dotfill\\\\ n^{th}\textit{ term of an arithmetic sequence} \\\\ a_n=a_1+(n-1)d\qquad \begin{cases} a_n=n^{th}\ term\\ n=\textit{term position}\\ a_1=\textit{first term}\\ d=\textit{common difference}\\ \cline{1-1} a_1=81\\ d=-27 \end{cases} \\\\\\ a_n=81+(n-1)(-27)\implies a_n=81-27n+27\implies a_n=108-27n](/tpl/images/0175/4982/8c2c7.png)
= a₁ + (n - 1)dFind an explicit formula for the arithmetic sequence:
81, 54, 27, 0
...
Mathematics, 18.08.2019 01:10 jby
Find an explicit formula for the arithmetic sequence:
81, 54, 27, 0
Answers: 2
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