# Thread: I'm going to need some assistance with this one..

1. ## I'm going to need some assistance with this one..

I don't even know where to start with this question.

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2. Use implicit differentiation with respect to t on your starting equation, then plug in the given values. You weren't given a value for z, so your solution for dz/dt will still have a z in it.

3. Originally Posted by wjm11
Use implicit differentiation with respect to t on your starting equation, then plug in the given values. You weren't given a value for z, so your solution for dz/dt will still have a z in it.
Did I do this right?
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4. Originally Posted by kitkalin
Did I do this right?
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Almost right; error on the left hand side: d(z^2)/dt = 2z(dz/dt)

Final solution: dz/dt = 0/2z = 0 (where z does not equal zero; note: it's already given that z is positive.))

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