Charles has decided that for every 3 pounds he loses in the next 6 months, he's going to splurge on a new t-shirt to show off his sculpted muscles. What behavior modification strategy is Charles using by doing this

self-reinforcement

the united states has a federal government. the president is the head of the federal government of the united states. however, each state forms its government for administration purposes. the powers of the state governments are exercised within restricted state boundaries. and citizens participate in this government by voting.

answer; the president uses mass media to gain support for policies;