If a point on the number axis moves 4 unit lengths to the left and then 8 unit lengths to the right along the number axis, and the number represented by the end point is 0, then it originally represents 0 What is the number? If this point takes 6 seconds from the start to the end, what is the average moving speed of this point?

If a point on the number axis moves 4 unit lengths to the left and then 8 unit lengths to the right along the number axis, and the number represented by the end point is 0, then it originally represents 0 What is the number? If this point takes 6 seconds from the start to the end, what is the average moving speed of this point?

The original number is 4-8 = - 4
The moving speed per second is (8 + 4) △ 6 = 2