Type of graph that shows a fun and interesting way to show data but it is not very accurate​

Answer these questions showing your work plz

What is the result of the following division?

The value, v, of kalani’s stock investments over a time period, x, can be determined using the equation v=750(0.80)^-x. what is the rate of increase or decrease associated with this account? 20% decrease 20% increase 25% decrease 25% increase