Answer:
197.8 cubic inches
Explanation:
You want to know the volume of water required to fill 7 vases half full if each is 8 inches tall and 3 inches in diameter.
Volume
The formula for the volume of a cylinder in terms of its diameter is ...
V = π/4·d²h
Since each of 7 vases is half full, and each is 8 inches high, the total height of the water is (1/2)(8 in)(7) = 28 in.
The water column is 3 inches in diameter, so has a volume of ...
V = (3.14/4)(3 in)²(28 in) ≈ 197.8 in³
Cristina needs 197.8 cubic inches of colored water.
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