If the original depth of water in a cone is 11 feet, sketch a graph of the depth of water versus time. Dimensions of the cone itself: h=12 ft, d=8 ft. Depth of the water changes at a rate of (h-12) feet per minute.
First make a table with the plotting points. The graph will be depth (h) versus time (s)
If the rate is h-12 it means it will take seconds to empty the cone.
use the formula h-12 = 60 to find h
at 0 seconds the graph will be at h = 11
at 30 s, h will be 6
at 60 s, the h will be 0
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