Help with these Math problems

<p><a href="http://imageshack.us/a/img707/4571/ercc.png%5B/url%5D"&gt;http://imageshack.us/a/img707/4571/ercc.png&lt;/a&gt;&lt;/p>

<p>*With this Math problem</p>

<p>In general, the nth term is n<em>(12^10). Since 12^12 = 144</em>(12^10), 12^12 must be the 144th term of the sequence, so (E) is correct.</p>

<p>Why is the nth term n<em>(12^10)? Also, how do you know that 12^12 = 144</em>(12^10)?</p>

<p>The first term = something.
The second term = something + something or 2somethings
The third term = something + something + something = 3somethings
The nth term = …=n(somethings)</p>

<p>Then the question is how to express 12^12 as n(12^10). But 12^12 = 12^2 x 12^10.</p>

<p>Thanks
10char</p>