Posted by math on Saturday, November 23, 2013 at 1:55pm.
The graph below shows the rate of natural gas usage (in therms per day) in one household for a 30  day period. Estimate the total number of therms used during this period. Use left endpoints and rectangles with widths of 3 days.
View graph at:
postimg.o rg/image/61nw3co3r/
I came up with ans 165.

math  math, Saturday, November 23, 2013 at 10:23pm
it's ok. I got it now.
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