Final answer:
The expression 3+(-7) is best represented by a football team gaining 333 yards on one play and then losing 777 yards on the next play, reflecting a net loss(option b).
Step-by-step explanation:
The situation that can be represented by the expression 3+(-7) is scenario (b): A football team gained 333 yards on one play, and the team lost 777 yards on the next play.
The number 3 represents the 333 yards gained, while the -7 represents the 777 yards lost.
To understand this, let's consider the expression 3+(−7). When adding a negative number, you are essentially subtracting that number. The expression simplifies to 3 - 7 which equals -4. This would represent a net loss, which is consistent with gaining yards on one play and then losing more yards on the next play.