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

Answer

5 and -4

Explanation

If the two triangle are congruent then they have the same area.

20 = x² - x

x² - x - 20 = 0

x² - x + (1/2)² = 20 + (1/2)²

(x - 1/2)² = 20.25

x - 1/2 = √20.25

x - 1/2 = 4.5                             or    x - 1/2 = - 4.5

x = 4 1/2 + 1/2                                      x = -4 1/2 + 1/2

   = 5                                                      = -4

The values of x are 5 and -4.