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

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

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

If then what does x equal to ?

Find the value of given expression. 

[76 – {90 ÷ 5 ⨯ (24 – 36 ÷ 3) ÷ 3}] 

If 1.5 a=0.04 b then .

A bag has Rs.420 in the denomination of Rs.1, Rs. 2 and Rs. 5 coins. The number Rs.1, Rs.2 and Rs.5 coins are in the ratio of 8: 1:5. How many coins of Rs.5 are in the bag?

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