1. The problem describes Polly's distance from a store over time based on a piecewise linear graph. 2. The graph starts at zero distance (Polly at the store), then distance increases (Polly drives away), then distance stays constant (Polly stops somewhere), then distance decreases back to zero (Polly returns to the store). 3. The mistake might be in interpreting the flat segment after the distance increases: it means Polly is stationary at some distance from the store, not at the store. 4. The final segment shows Polly returning to the store, as distance decreases back to zero. 5. So Polly's activity is: at the store, drives away, stops briefly away from the store, then returns to the store. 6. No mathematical formula is needed here; the graph interpretation is key. 7. The mistake would be to think Polly stays at the store during the flat segment after moving away, but the graph shows she is away from the store then. Final answer: Polly is at the store, drives away, stops briefly away from the store, then returns to the store.