Question

c. what was the greatest single - day decrease in visitors? visitors (thousands) day visitors (thousands) day visitors (thousands) day visitors (thousands) day

Explanation:

Step1: Extract daily visitor counts

From the line graph (lower right, connected points, which is the appropriate display for tracking changes):
Day1: 30,000; Day2: 35,000; Day3: 25,000; Day4: 20,000; Day5: 30,000; Day6: 20,000; Day7: 10,000

Step2: Calculate daily changes

Day1→Day2: $35000-30000=5000$ (increase)
Day2→Day3: $25000-35000=-10000$ (decrease of 10,000)
Day3→Day4: $20000-25000=-5000$ (decrease of 5,000)
Day4→Day5: $30000-20000=10000$ (increase)
Day5→Day6: $20000-30000=-10000$ (decrease of 10,000)
Day6→Day7: $10000-20000=-10000$ (decrease of 10,000)

Step3: Identify maximum decrease

The largest single-day decrease is 10,000.

Answer:

10000 visitors