Answer:
B
Step-by-step explanation:
If -10 is 10 seconds before he finishes his first lap, and 10 is 10 seconds after he finishes his first lap, whats in the middle of that?! 0 of course, so thats when he finishes his first lap.
The answer is B
X = 3
3x = -3x + 15
3x +2x = 15
5x = 15
x = 3
Answer:?
