In 2010, about what percentage of the world's land area was forested?

Studying the growth of (Y/N) in the United States over the period 1909-1957, Robert Solow found that growth in multifactor productivity accounted for ________ of it

A) ten percent B) twenty-five percent C) one-third D) roughly half E) seven-eighths

Refer to Figure 34.4. The breakeven level of income in this example is

A. $5,000. B. $7,500. C. $17,500. D. $12,500.