Answer
please see step-by-step
Work Step by Step
(See p.707)
A sequence is a FUNCTION defined on the set of positive integers,
and the function values f(1)$=a_{1}$, f(2)$=a_{2}$, f(3)$=a_{3}$,...
are written as
$a_{1},a_{2},a_{3},...,a_{n},...$
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The graph of a sequence is a set of isolated points
$(n, a_{n})$, where n are positive integers,
which are points of the graph of f(x),
$(n,f(n)),$
where we take for the values of x positive integers only.
(See figures 8-1.a and 8-1.b. on page 708.
