Respuesta :

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The tree trunk is a cylinder so we apply that formula:

It is VCylinder = density x pi x radius x height
So the given in our problem is:
Density = 45 lb/ft^3 = 720.8 kg / m³
Radius = 3ft 
Height = 10 ft

Insert variables that in our equation:

VCylinder = 720.8 kg / m³ * pi * 3ft² * 10 ft =  5771.26 kgs

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