The mistake that Kristy made in calculating the volume is that she treated it as a hemisphere instead of a Sphere.
We are given the volume of the sphere as 144π cubic units.
From the attached file, we see that the radius of the sphere is 6.
Formula for Volume of a Sphere is;
V = ⁴/₃πr³
Thus;
V = ⁴/₃π * 6³
V = 288π cubic units
Thus, the mistake that Kristy made in calculating the volume is that she treated it as a hemisphere instead of a Sphere.
Read more about Volume of Sphere at; https://brainly.com/question/10171109
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