If $$ {1\over3} ({12x\over5}-{1\over2})+{6\over5}={7\over6}$$ then what is the value of x?

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

For what value of m will the system of equations 18x-72y+13=0 and 7x-my-17=0 have no solution?

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

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

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

The smallest natural number, by which 3000 must be divided to make the quotient a perfect cube, is : 

The value of x in the given equation
$$ {23 ^2 + \sqrt{x}=625}$$