Question

I need help, please??

Answer 1

This follows from the quotient rule:

`y=\frac{1+\ln t}t\implies(\mathrm dy)/(\mathrm dt)=(t\left(\frac1t\right)-(1+\ln t))/(t^2)`

and simplifying a bit you end up with

`(\mathrm dy)/(\mathrm dt)=-(\ln t)/(t^2)`

(note that
`y(t)` is only defined for
`t>0`, which lets us simplify
`t\left(\frac1t\right)=1`)