







The square root of 21 between what two numbers? 
20080403 

Danielle pose la question : The square root of 21 between what two numbers? Penny Nom lui répond. 





Estimates 
20000411 

Sue Jordan pose la question : I am looking for examples of estimates for underestimating and overestimating. When would you do each one. For my child age 11 6th grade. Penny Nom lui répond. 





Approximations 
19991220 

Adrian Valc pose la question : Longtime ago I red an article about surprizing (and in a way frustrating) results in math, for example the limit of a nicely defined infinite series which was believed to be a simple rational number, but later was determined to be a transcendent number that missed the rational value by an incredibly small amount (so for example the limit proved to be 2.75000...00137.. with a lot of 0's in between). I cannot find that article anymore, so i was wondering if you have any such examples, or you can point to any relevant information source? Chris Fisher lui répond. 





Radicals 
19980915 

Lana Sabo pose la question : Question: fifteen times the square root of twenty, divided by the square root of 2. nine subtract the square root of fortyfive, divided by 3. the square root of 18 plus the square root of 12, divided by the square root of 3. Harley Weston lui répond. 

