Suppose the temperature of a cup of tea in degrees Fahrenheit minutes after it has been poured may be modeled by the equation .

a) What is the temperature of the tea after 3 hours?

degrees Fahrenheit

b) How long does it take for the cup of tea to cool to 100 degrees?

minutes

c) What does each part of this equation mean?

A:

B:

C:

**Hint:**