The best estimate of r is 0.
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This isnt a question its just all numbers and inches what did u want to get from that?
167 is the volume of the prism
If - 1 is a zero then

is a factor.
Dividing with this factor using the long division approach, we get the quadratic factor to be,

(see attachment).
We can rewrite the polynomial as

We can further factor as

That is