CPM Homework Help : CCA2 Problem 10-9

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10-9.

Write a formula for the $n$ ^th term of each of the following series.

$3+10+17+$ …
Hint (a):
The terms are increasing by $7$ each time.
$t(1)=3$
Answer (a):
$t(n)=3+7(n-1)$
Simplified, this becomes $t(n)=7n-4$ .

$20+11+2+$ …
Hint (b):
What is added to each term to get the next?
What is the first term?

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