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Volume of Cylinder = 
Based on what we're told:
r (radius) =
h (height) =
So:
Volume of cylinder =
=
Based on what we're told:
r (radius) =
h (height) =
So:
Volume of cylinder =
=
Answer:
Option B:
Step-by-step explanation:
The parabola has its concavity downwards, so we need a function in the model:
With a negative value of 'a'
The vertex is (0,0), so we have that:
The x-coordinate of the vertex is given by the equation:
So we have a function in the model:
With a < 0
The only option with this format is B: