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Mathematics 7 Online
OpenStudy (anonymous):

HELP! FILE ATTACHED. WILL GIVE MEDAL!!

OpenStudy (anonymous):

OpenStudy (anonymous):

What is the average rate of change for the relation shown below between x = -2 and x = 2? Enter your answer as a reduced ratio, like this: 2/3

OpenStudy (anonymous):

@dan815

OpenStudy (anonymous):

@pooja195

OpenStudy (anonymous):

@Michele_Laino

jimthompson5910 (jim_thompson5910):

Draw a vertical line through x = -2. Where does this vertical line cross the parabola?

OpenStudy (anonymous):

(-2,8)@jim_thompson5910

jimthompson5910 (jim_thompson5910):

how about for x = 2 ?

OpenStudy (anonymous):

(2,0)

jimthompson5910 (jim_thompson5910):

we have the two points (-2,8) and (2,0)

jimthompson5910 (jim_thompson5910):

the average rate of change from x = -2 to x = 2 is the same as the slope through those two points

jimthompson5910 (jim_thompson5910):

use this slope formula \[\Large m = \frac{y_{2}-y_{1}}{x_{2}-x_{1}}\]

OpenStudy (anonymous):

-8/4

jimthompson5910 (jim_thompson5910):

which reduces to what?

OpenStudy (anonymous):

-4

OpenStudy (anonymous):

or is it -2

jimthompson5910 (jim_thompson5910):

-8/4 = -2

jimthompson5910 (jim_thompson5910):

the slope of the line through (-2,8) and (2,0) is -2 so the average rate of change is -2

OpenStudy (anonymous):

thank you so much! @jim_thompson5910

jimthompson5910 (jim_thompson5910):

you're welcome

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