#### To determine

**To find:** Natural logarithm, Common logarithm y=logbx and Graph of natural logarithm function and natural exponential function.

#### Answer

f(x)=logex=lnx_, f(x)=log10x_ and graph is given below

#### Explanation

If the base of a logarithm is e, the logarithm is called the natural logarithm

f(x)=logex=lnx.

If the base of a logarithm is e, the logarithm is called the natural logarithm

f(x)=log10x.

Graph is given below:

**Conclusion:** f(x)=logex=lnx_, f(x)=log10x_ and see the graph.