The exponential functions are , ,  and .

Rewrite the curves as , ,  and .

Graph the functions , ,  and  on a common screen.

Observe the graph,

From the properties of the exponential functions,

If , then   is decreasing.

If , then   is increasing.

Therefore, the functions  and , which are having base greater than one are monotonoically increasing.

The above curves are approaching zero as  and the curves are approaching infinite as .

Therefore, the functions  and , which are having base less than one are monotonoically decreasing.

The above curves are approaching zero as  and the curves are approaching infinite as .

All the curves passing through the point .

Graph:

The functions  and , which are having base greater than one are monotonoically increasing.

The functions  and , which are having base less than one are monotonoically decreasing.