which graph could represent a constant balance in a bank account over time?

Answer: The third graph (the one with a horizontal line)

Explanation:

Step1: Understand constant - value concept

A constant balance means the balance does not change with time.

Step2: Analyze graph types

In a balance - vs - time graph, a horizontal line indicates that the balance value (y - axis) remains the same as time (x - axis) progresses.

Step3: Evaluate each graph

The first graph shows a decreasing balance over time. The second graph is a vertical line which is not a valid representation for balance over time. The third graph has a horizontal line, representing a constant balance. The fourth graph shows an increasing balance over time.