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Answer:
The formula has a typo. Should be
V= (1/2) ((4pir^3)/(3))+ pi r^2 (y-r)
or
v = 2π/3 r^3 + πr^2 (y-r)
= πr^2 y - π/3 r^3
2πryr' + πr^2 - πr^2 r' = 0
r' = r/(r-2y)
r'(6) = 2/(2-12) = -1/5
dr = dr/dy * dy
= -1/5 (-.25) = 0.05
so, r = 2.05
Step-by-step explanation: