If $$ {x^2} -4x-1 $$ then the value of $$ {{x^6} -{x^4}+{x^2}-1}\over {x^3}$$ will be

The difference between the interior and the exterior angles of a regular polygon is 150^o. Find the number of sides in the polygon.

If the amount is $$ 3{3\over8}\%  $$ times the sum after 3 years at compound interest compounded annually, then the rate of interest per annum is 

If income tax is increased by 24 % , the net income is reduced by 1 % . The rate of income tax is 

In a regular polygon, the exterior and interior angles are in the ratio 1 : 4. The number of sides of the polygon is 

Find the total number of Prime Factors of 720 ? 

If A alone take 4 days more than A and B worked together. If B alone take 16 days more than A and B together. How many days they take together? 

A pipe of diameter d can drain a certain water tank in 40 minutes. The time taken by a pipe of diameter 2d for doing the same job in: