Tucker doesn’t like to go to the board during lessons because he’s uncomfortable with everyone looking at him, but his teacher r
equires class participation. After discussing this problem with Tucker and his parents, his teacher tells the other students to put their heads down whenever it’s Tucker’s turn to work a problem on the chalkboard. The teacher’s suggestion is an example of A. negative reinforcement
in 589, the Sui dynasty restored native rule to northern China and reunified the ... recovery under the Northern Wei that was even greater than the prosperous ...