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whats is "r" equal too ?

the question says 3d=h

radius is half so 2/3r=h?

other way around. d = 3h

so r = 3h/2

and V = πr²h/3, so make the substitution for r then take the derivative

okey i did eberyhing i am getting 1/9pi and u ?

i did somthing wrong

yeah I got something different? What was your derivative?

did u get 1/6pi?

yes

If you mean \[\Large \frac{1}{6\pi}\] then you are correct

how ?

oh, that's what I thought you meant

what did you get for dV/dt ?

my der was 9/12pih3 dh/dt?

after putiing in 3/2h

the h^3 part is incorrect

how

you will have h^3 in the V volume formula
but after you derive, it turns into 3h^2

the formula for cone is x=1/3r2h

when 3/2h goes in it become h2 then h3 by timising the outside h

|dw:1433903048615:dw|

|dw:1433903137752:dw|

ok what are the steps take the derv fist then sub?

Sub for r first because we don't have a value for dr/dt, then take the derivative

wait so (3h/2) doesnt equal 9h2/4? it eiqls 9h/4?

oh wait i think i get it now

you good?

h is 2 right

yes

then 9(2)^2 = 36

hold on the 1/3 is gone beacuse of derv right

damn i am going to take 5 min brake