You probably need to use some tables to interpolate.
But without those, nine squared is 81
10 squared is 100
Using that, which is rather loose, then
the difference in 84.4 and 81 is 3.4
the difference in 81 and 100 is 19
so 3.4/19 = x/1 where x is the addition to 9.0
Square root of 84.4 then is 9.18 to the nearest hundredth, approximately
Thank you so much bobpursley!
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