The graph shows the temperature of a room, in degrees fahrenheit, over time, t, in minutes . for which values of t (time) is the temperature increasing? . choose all answers that are correct. a. from t = 0 to t = 20 b. from t = 20 to t = 40 c. from t = 40 to t = 50 d. from t = 50 to t = 70 e. from t = 70 to t = 80