To determine how many golf balls Andy lost, we need to find the difference between the number of golf balls he started with and the number he had left at the end of the day.
Andy started with 9 golf balls and has 6 left.
To find the number of balls he lost, we can set up the equation:
\[ \text{Lost balls} = \text{Starting balls} - \text{Remaining balls} \]
This gives us:
\[ \text{Lost balls} = 9 - 6 = 3 \]
So, Andy lost 3 golf balls.
Looking at the number sequences provided, the correct sequence that matches this word problem is:
9 - 3 = 6
This sequence represents the situation and correctly interprets the problem.