Which major mathematical idea did the aztecs develop?

Which of these innovations led to increased production in american factories in the early 1800s? a. the use of interchangeable parts b. the construction of canals c. the invention of the mechanical reaper d. the availability of electricity

Which of the following statements would be supported by both a communist and a utopian socialist? a) a government should restrict the number of imports and exports to protect its gold reserves b) governments have no right to restrict the actions of businesses or customers c) society will shift towards socialist ideals without the need for violent revolutions d) the gains of the industrial revolution should be shared by all members of society

How does the balance of trade look different in the us today vs hot it looked in the 70's