Factorise 5x-10 please help

To factor an expression, you need to find the GCF or Greatest Common Factor of all of the pieces of the expression.

The greatest common factor of 5x and -10 is 5.  So, when we factor this, we divide both pieces of the expression by 5.

Your final answer is 5(x-2)

The probability of her winning a game would be 5/9 because if she loses 4/9 games then 5/9 games must be wins.