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Find a relationship between the height and the radius of the cylinder.
V=64π h-π/4h^3
h≈ 9.24 inches
V≈ 1238 cubic inches
Let's draw a vertical cross-section of the sphere and the cylinder.
To see the graph you will need to adjust the window. The height of the cylinder is certainly not larger than the diameter of the sphere, so let's use 0 and 16 as horizontal bounds of the graph. Push WINDOW, change the settings, and push GRAPH.
To find the maximum point on the graph push 2nd and TRACE, then choose maximum
from the menu.
The calculator will prompt you to choose a left and right bound to provide the calculator with a best guess of where the maximum might be.
Let's interpret the result we get from the calculator.