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

At wind speeds above 1000 centimeters per second (cm/sec), significant sand-moving events begin to occur. wind speeds below 1000 cm/sec deposit sand and wind speeds above 1000 cm/sec move sand to new locations. the cyclic nature of wind and moving sand determines the shape and location of large dunes. at a test site, the prevailing direction of the wind did not change noticeably. however, the velocity did change. fifty-nine wind speed readings gave an average velocity of x = 1075 cm/sec. based on long-term experience, σ can be assumed to be 245 cm/sec. (a) find a 95% confidence interval for the population mean wind speed at this site. (round your answers to the nearest whole number.) lower limit cm/sec upper limit cm/sec