Respuesta :

hmagrini321oywtvw
its 89 because 9 times 2 is 81 and 10 times 2 is 100 there nothing to multiple 2 by something to get 89
JonHenderson55
The answer is:  [D]:  "89" .
_____________________________________________
Note:
_____________________________________________

√100 = 10 ; 

√64  = 8 ;

√81  = 9 ; 

√89 = 9.4339811320566038 .
____________________________________________________