Subtract 6x^2-5x+3 from (3x^2+8x-4)
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The volume for a pyramid is 
, where B is the area of the base and h is the height. We are given the volume, and the base and height in terms of x. Our formula then looks like this: 
. Simplifying the right side we have 
. Multiply both sides by 18 to get rid of the fraction and we have 
, so x = 117.575
If the pattern continues, so that each term is separated by a distance of 3, then the sequence is given by the recursive rule
From this definition, we can write in terms of
:
and so on, up to
(notice how the subscript on <em>a</em> and coefficient on 3 add up to <em>n</em>)
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