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

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

There are some boys and girls in a room. The square of the number of the girls is less than the square of the number of boys by 28. If there were two more girls, the number of boys would have been the same as that of the girls. The total number of the boys and girls in the room are

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

Direction : What value should come in the place of question mark (?) in the following questions?

80% of 10% of 340 = ?

(0.04)^-1.5 on simplification gives: 

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