Which expression represents the volume, in cubic units, of the frustum?

Find the frustum’s volume by subtracting the small cone from the original large cone. Using V = ⅓πr²h, the large cone has radius 7.5 and height 19, while the small cone has radius 3.5 and height 8. So the expression is ⅓π(7.5²)(19) − ⅓π(3.5²)(8), which is choice A.

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