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Home > CC4 > Chapter 10 > Lesson 10.2.3 > Problem 10-104

  1. Marley’s cup of tea was cooling. Its temperature with relation to time can approximately be modeled by the function f(t) = 140(0.5)t + 72. Homework Help ✎

    1. What does the 72 represent in this situation?

    2. Marley decides to save energy and lower the temperature of her cottage to 68º. How would this change the model?

As t gets larger, the function value approaches 72.

Consider the significance of part b. Will the tea get cooler than surrounding air temperature?

f(t) = 140(0.5)t + 68