Biologists have noticed that the chirping of crickets of a certain species is related to temperature, and the relationship appears to be very nearly linear. A cricket produces 115 chirps per minute at 67 degrees Fahrenheit and 176 chirps per minute at 83 degrees Fahrenheit.

A) Find a linear equation that models the temperature T as a function of the number of chirps per minute N.
T =

B) If the crickets are chirping at 154 chirps per minute, estimate the temperature:
Temperature =

C) If the temperature is 70, approximately how fast are the crickets chirping? chirps per minute.

D) If the temperature is currently 70, and the temperature is falling at 5 degrees per hour, how fast is the rate of cricket chirping changing? (Try saying cricket chirping changing five times really fast.)

Be sure you know the correct units of the answer.