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Mathematics 13 Online
OpenStudy (anonymous):

use eight intervals beginning with 15.5-20.4

OpenStudy (anonymous):

20.4-15.5=4.9 4.9/8=.6125 {interval size} 15.5,16.1125,16.725,17.3375,17.95,18.5625,19.175,19.7875,20.4

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