The number, whose square is equal to the difference between the squares of 975 and 585, is: 

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

The smallest 4- digit number which is a perfect square is 

If $${4x^2={15^2-9^2}}$$ then the value of x is

The sum of the squares of two positive integers is 100 and the difference of their squares is 28. The sum of the numbers is: 

Find the value of x:
2³ × 3⁴ × 1080 ÷ 15 = 6^x

The simplified value of
$${{1\over 3}÷{1\over 3}×{1\over 3}\over{1\over 3}÷{1\over 3}of{1\over 3}}-{1\over 9}$$

If (a + b):(b + c):(c + a) = 7:6:5 and a + b + c = 27, then what will be the value of 1/a: 1/b :1/c?