2 21. During a science experiment, a chemist boils a liquid and then sets it on the lab
table and records the temperatures as it cools. The graph shows y, the
temperature in degrees Centigrade, and x is the number of minutes after the
liquid is set on the table.
Liquid Temperature
у
Temperature (°C)
120
1000
80
60
40
20
х
0 5 10 15 20 25 30 35 40 45
Time (minutes)
Which equation is the best model for this data?
A. y = 100(0.75)
B. y = (0.75)* + 100
c. y = 80(0.75)* + 20
D. y = 20(0.75)* + 80