What must be added to `3^(10)` to get `3^(11)`

What must be added to 2^(10) to get 2^(11) ?

How much is added to 1 to get 6 ?

If x is a natural number What number is to be added to x^2+6x to get a perfect square?

If x^2+x+2=(x-2)(x+a)+b a) Find 'a' and 'b'. b) What number should be added to x^2+x+2 to get a polynomial having a factor '(x+3)'

The amount of solute (mol. Mass=60) that must be added to 180 g of water so that the vapour pressure of water is lowered by 10% is

How much water should be added to 3M HCl to get 1L 0.25M HCl ?