Respuesta :

He is right. He starts at, lets say 0. He walks to the left of 20 ft. Now he's at 20. Then he walks 20 ft to the right. He's back at 0.

allisonsalyer14
yes because if he walks 20 feet to the left and then walks back 20 feet to the right, he will be back in his original position (think of it as +20 -20)