CPM Homework Help : CCG Problem 7-57

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7-57.

Write an equation for each of the following sequences.

$40$ , $60$ , $80$ , $\dots$
Hint (a):
Is the sequence a geometric sequence or an arithmetic sequence?
More Help (a):
The equation for an arithmetic sequence is: $a_n=m(n-1)+a_1$
Answer (a):
$\begin{array}{l} a_n=40+20\left(n-1\right)\\ \quad \; =20+20_n \end{array}$

$3$ , $\frac { 3 } { 2 }$ , $\frac { 3 } { 4 }$ , $\dots$
Hint (b):
See part (a) for help.
More Help (b):
The equation for a geometric sequence is: $a_n=a_1·b^{n−1}$

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