Posted by sarah on Friday, March 1, 2013 at 9:05pm.
in a set of number rods,there is one rod of length 10,2 rods of length 9,3 of length 8,and so on.If all these rods were laid end to end in one line,how long would the line be ?

math  Dr. Jane, Saturday, March 2, 2013 at 9:34am
10 + 9 + 9 + 8 + 8 + 8 =
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