Between 2pm and 4pm the average rate of change is zero.
I can't see the answer choices for the second part of the question.
The value of x is the meaning of the word of the value of x=14
2x² <span>- x + 8 = 0
D</span>iscriminant = b² - 4ac
a=2, b=-1, c=8
D = (-1)² - 4 * 2 * 8 = 1 - 64 = -63
