A scientist recorded the amount of substance X present in an ongoing chemical reaction. This table gives the amount of substance X over the first 10 minutes. The data can be modeled using an exponential function. Time (min) 2 4 6 8 10
Substance X (g) 15.6 13.2 11.8 11.1 10.2

Based on the data, which measurement is closest to the amount of substance Y that will be present after 20 minutes?

0 g

5.1 g

6.0 g

7.2 g