Since 1960, life expectancy at birth has ________ in the United States

Maria Brown is a young tennis player who has shot to fame after defeating Sarah Knowels in three consecutive matches. In the fourth match, Sarah decided to serve left each time. Is this an optimal winning strategy for Sarah?

What will be an ideal response?

If a reform of the tax laws encourages greater saving, the result would be

a. higher interest rates and greater investment. b. higher interest rates and less investment. c. lower interest rates and greater investment. d. lower interest rate and less investment.