Which statement best explains why the United States grew into a world economic power in the 20th century?
O A. The United States prevented other countries from abandoning the
gold standard.
O B. The United States increased its participation in international trade.
C. The United States put effective trade barriers in place to limit trade
with other nations.
D. The United States stayed out of major world wars and instead
made economic investments.

When a company produces and sells x thousand units per week, its total weekly profit is p thousand dollars, where upper p equals startfraction 800 x over 100 plus x squared endfraction . the production level at t weeks from the present is x equals 4 plus 2 t. find the marginal profit, startfraction dp over dx endfraction and the time rate of change of profit, startfraction dp over dt endfraction . how fast (with respect of time) are profits changing when tequals8?

Asap! the following information is given for tripp company which uses the indirect method.

In 1948, the president of the united states earned a salary of $75,000. in 2000, the president earned a salary of $400,000. knowing that the cpi for 1948 is 24.1 and the cpi for 2000 is 172.2, convert the 1948 salary to constant 2000 dollars. when comparing constant dollar amounts, whose salary was worth more--harry truman, president in 1948, or bill clinton, president in 2000