$1,000 is taken out of a bank vault each day and noting is added back. which models the situation, linear equation with a positive rate of change, linear equation with a negative rate of change, exponential decay function, or exponential growth function?

In the diagram, points d and e are marked by drawing arcs of equal size centered at b such that the arcs intersect ba and bc. then, intersecting arcs of equal size are drawn centered at points d and e. point p is located at the intersection of these arcs. based on this construction, m , and m