Pauley graphs the change in temperature of a glass of hot tea over time. He sees that the function appears to decrease quickly at first, then decrease more slowly as time passes. Which best describes this function?
A
It is linear because the graph decreases over time.B
It is linear because there is both an independent and a dependent variable.C
It is nonlinear because linear functions are increasing functions.D
It is nonlinear because linear functions increase or decrease at the same rate.