CPM Homework Help : CCA2 Problem 2-130

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2-130.

Write an equation for each of the following sequences.

$10,2.5,0.625,\dots$
Hint (a):
Is this geometric or arithmetic?
Answer (a):
This is geometric.
$t(n) = 10 \left( \frac{1}{4} \right)^{n-1}= 40 \left( \frac{1}{4} \right)^{n}$

$-2,-8,-14,\dots$
Hint (b):
Is this geometric or arithmetic?

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