How many positive integers less than 1000 are multiples of 11 whose square roots are whole numbers

The value of $${4- \sqrt{0.04} \over 4+\sqrt{0.4} } $$  is closed to

Simplify : $$\sqrt{[(12.1)^2-(8.1)^2]÷[(0.25)^2+(0.25)(19.95)]} $$

Evaluate: $${-(4-6)^2-3(-2)+।-6।\over 18-9÷3×5}$$

$$ { \sqrt{(0.798)^2+0.404×0.798+(0.202)^2}+1=?} $$

$$ \sqrt{0.00004761} $$   equal to

Find the value of   $$ {(0.75)^3\over1-.75}+[0.75+(0.75)^2+1]$$

On simplification of   $$ {(2.664)^2-(2.356)^2\over0.288}$$