Which best describes the policies of republicans during the 1920s? a. they favored involvement in world affairs. b. they fought hard for improved civil rights. c. they favored progressive reforms. d. they acted to support big business. (the right answer is d but i was asking this so anyone who might need it in the future has it)

D. They acted to support big business.

During the Progressive Era (1890-1920), ending with the administration of President Woodrow Wilson, actions had been taken to regulate businesses and address the problems caused by industrialization and urbanization.  But promising what was dubbed a "return to normalcy," the Republican party took control of both houses of Congress and the presidency in the 1920 elections.  The Republican presidents of the 1920s (Harding, Coolidge, and Hoover) went in the opposite direction of previous Progressive Era policies.  The were inclined to let corporations operate in a more unregulated fashion. They also raised tariffs to protect American business, and cut taxes for wealthy business owners.  

Use the formula: (n-2)×180, where n is the number of sides(18-2)×180= 28800, now this is the full exterior angle of 18-gon so you divide it by 18.28800÷18=160