What is the value of X ?, if 7580 - X = 3440

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

The value of $$ \sqrt{11.981+7\sqrt{1.2996}}$$ is closest to 

If 551 ÷ 29 = 19 then 5.51 ÷ 0.0019 = ?

Direction: what should come in place at question mark(?).

45% of 224×?% of 120=8104.32

The square root of a positive number less than 100 lies between

If 1.5 a=0.04 b then $$ {b-a\over b+a}$$.

If $$ {\sqrt{1+{473\over{256}}}=1+{x\over 16}}$$ then what does x equal to ?