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after the end of a baseball game, there were 1,000 cars in the parking lot. the graph below represents the number of cars remaining in the parking lot after x minutes.

what does the slope represent in the graph?

The slope represents the decreasing about of cars as they leave the parking lot x minutes after the game. The amount of cars is steadily decreasing as the time after the game increases and the slope shows the rate at which the amount of cars in the parking lot is decreasing. 

Zero is the mid point of the line segment

Sry i don't know the answer but are u from kastner?