How can one determine whether demand is elastic or inelastic?

Which of the following statements best describes the importance of the battle of

Which of the following does not describe europe after that fall of the western roman empireh

The telegraph, the transatlantic telegraph cable, and the telephone were important to businesses after 1850 because of a. they created a system for developing new inventions. b. they filled a need that other inventions of the day could not. c. they attracted investors and created the stock market. d. they made picture-taking a popular american pastime.