Please please i need help i dont know this

The largest lake in south america is lake titicaca?

Profits are maximized when marginal revenue and marginal costs are a. set c. equal b. less than market price d. greater than market price

Germany italy and japan formed the tripartite pact in part because they: a. hoped to convince the united states to stay out of world war ii b. share the ruling philosophies based on communist economics c. resented the agreements they were forced to sign at the munich conference d. believed their territories were threatened by aggressive foreign states