If the sum and difference of two number are 20 and 8 respectively, then the difference of their squares is: 

The product of two whole numbers is 37. The square root of the difference of the numbers is

If a² + a + 1 = 0 then the value of a⁹ is. 

In a garden of 42 trees, 3/7 of them are Neem trees and the rest are Mango trees. Find the number of Mango trees.

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

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

The value of 24 ÷ 4 ×(3 +3) ÷2 is:

Assume that
$$\sqrt{3} = 3.605 \ (approximately)  $$
$$\sqrt{130} = 11.40 \ (approximately)  $$
Find the value of
$$\sqrt{1.3} + \sqrt{1300}+\sqrt{0.013}  $$