Answer
$6x^3-2x+1$
Work Step by Step
Volume = height $\times$ width $\times$ length
$(36x^5-12x^3+6x^2) = (2x) \times (3x) \times$ length
$36x^5-12x^3+6x^2 = 6x^2 \times$ length
Length $= 6x^3-2x+1$
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