Describe exponential growth

If some quantity is growing linearly with time, then

- - its rate of growth is constant

and

- - its value is (a number) x (time).

A graph of its value against time is a rising straight line.

If the quantity is growing exponentially with time, then

- - its rate of growth is (a number) x (time)

and

- - its value is (time) ^ (a number)

A graph of its value against time is a rising curve.