Determine whether the given sequence is arithmetic, geometric or neither. If the sequence is arithmetic, find the common difference; if the sequence is geometric, find the common ratio.
(1) {8 - 3n/4}
(2) {(5/4)^n}
For an arithmetic sequence there are constants $\displaystyle a$ and $\displaystyle b$ such that the $\displaystyle n$-th term can be written in the form:
$\displaystyle a+bn$
For a geometric sequence there are constants $\displaystyle a$ and $\displaystyle b$ such thatthe $\displaystyle n$-th term can be written in the form:
$\displaystyle ab^n$.
Now look at the two cases given in your question and you shound be able to answer this your self.
CB