What natural resources have been important to the economic success of the United States?

How did California become the nation's most populous state?

What industries are found in the South today?

True or False. The polar form of a nonzero complex number is unique.

What role did water play in the development of the Midwest?

What changes have taken place in the industrial base of the Northeast?

What are the four main differences between monocots and dicots? ___________________________

What are some examples of the cultural diversity of the United States?

In what industry do most Americans work?

Telephone calls from New York to Los Angeles are transported as follows: The call is sent first to either Chicago or Memphis, then routed through either Denver or Dallas, and finally sent to Los Angeles. The number of phone lines joining each pair of cities is shown in Table 39. a. Formulate an LP that can be used to determine the maximum number of calls that can be sent from New York to Los Angeles at any given time.b. Use the Ford–Fulkerson method to determine the maximum number of calls that can be sent from New York to Los Angeles at any given time. Table 39:

$$\begin{matrix} \text{Cities} & \text{No. of Telephone Lines}\\ \text{N.Y.–Chicago} & \text{500}\\ \text{N.Y.–Memphis} & \text{400}\\ \text{Chicago–Denver} & \text{300}\\ \text{Chicago–Dallas} & \text{250}\\ \text{Memphis–Denver} & \text{200}\\ \text{Memphis–Dallas} & \text{150}\\ \text{Denver–L.A.} & \text{400}\\ \text{Dallas–L.A.} & \text{350}\\ \end{matrix}$$

Let G be a group. Define a function f:G$\rightarrow$G by f(g)=g$^{-1}$. Prove that f is a permutation of G.

Why is the United States a leader in agricultural production?

What factors led the United States to become a superpower?

How did the Louisiana Purchase change the United States?