Write a function to represent this series of transformations: rotation of 90° counterclockwise about the origin, point O, then a reflection across the x-axis

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