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Mathematics 9 Online
OpenStudy (anonymous):

i need help with finding upper and lower sums of the shaded region and the rectangles have a width of 1. i have the graph, and i know b-a/n=4-0/4, which is one, but after that i am confused, i will try to post the graph, please help http://assets.openstudy.com/updates/attachments/51566478e4b07077e0c033ef-moonlitfate-1364616709417-4.2_33.png

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