Question 1209200
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I'll assume that you meant to say "4125π cubic units" or meant to put a small 3 above "units" to indicate volume. You cannot use linear units for volume. 


diameter = 30 ---> radius = 15  (since 30/2 = 15)


V = (1/3)*π*r^2*h
4125π = (1/3)*π*15^2*h
4125 = (1/3)*225*h
h = 3*4125/225
h = <font color=red>55</font> is the final answer
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