Respuesta :

Given:-

[tex]f(x)=\frac{x}{x+4}[/tex]

To find:-

[tex]f(x)=(\frac{4}{t})[/tex]

The required solution is,

Now we find,

[tex]f(\frac{4}{t+4})[/tex]

The required solution is,

Now to find the value of x when,

[tex]f(x)=3[/tex]

The solution is,

These are the required solutions.

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