Which expression does not represent a square root of a perfect square integer? a) 100 b) 64 c) 81 d) 89

The answer is:  [D]:  "89" .

Note:


√100 = 10 ; 

√64  = 8 ;

√81  = 9 ; 

√89 = 9.4339811320566038 .

Answer: the correct answer is 10step-by-step explanation: let the number be n, then the expression becomes,then“twelve more than the quotient of a number and two, decreased by four” iswhen n=4,we substitute 4 whetever we see n to get,we simplify to obtain,we further simplify to get,therefore the correct answer is c.