The scatter plot shows the concentration, in milligrams per liter (mg/L), of a chemical in a solution at various times, in hours, after a reaction began. Based on the trend shown in the scatter plot, which statement best describes the rate at which the chemical's concentration is decreasing?
Data Points for Scatter Plot:
(0, 100)
(1, 70)
(2, 50)
(3, 38)
(4, 30)
(5, 25)
The concentration is decreasing at a constant rate.
The concentration is decreasing at an increasing rate.
The concentration is decreasing at a decreasing rate.
The concentration is decreasing only during the first 2 hours.
