anonymous
  • anonymous
Use the graph below for this question: graph of parabola going through negative 1, 5 and negative 2, 7. What is the average rate of change from x = −1 to x = −2? 2 −2 4 −1
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
HELPPPPp!!!!!!!!!!
ZeHanz
  • ZeHanz
Imagine what happens if you go from x = -1 to x = -2: At x = -1 you are at height 5, at x = -2 you are at height 7.
anonymous
  • anonymous
2

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ZeHanz
  • ZeHanz
True, and because you move only one unit (to the left) the average rate of change would also be 2. But: rate of change is measured going from left to right. The question should have been (imo) what is the average rate of change between x=-2 to x=-1. It is -2.
anonymous
  • anonymous
That you so much you really are a life saver!!!
ZeHanz
  • ZeHanz
If you like to use a formula: avg rate of change = delta y / delta x, So: \(\dfrac{y_2-y_1}{x_2-x_1}=\dfrac{7-5}{(-2)-(-1)}=\dfrac{2}{-1}=-2\)
ZeHanz
  • ZeHanz
yw!

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