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OpenStudy (anonymous):
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OpenStudy (anonymous):
Directrix (directrix):
19. 9/(z+2) + z/(z+2) = (9 + z)/ (z + 2)
Directrix (directrix):
For multiple questions, it is best to list them separately. Suggestion: Do that with the two average rate of change problems.
Directrix (directrix):
20. (3x+1)/4x - (x-2)/4x = [(3x+1 - (x-2)]/ 4x = (3x+1-x +2)/4x = (2x +3)/4x
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