George and Barbara will be retiring in four years and would like to buy a lake house. They estimate that they will need $150,000 at the end of four years to buy this house. They want to make four equal annual payments into an account at the end of each year. If they can earn 16% on their money, compounded annually, over the next four years, how much must they invest at the end

In response to the gates malaria forum in october 2007, countries are debating the pros and cons of eradication. dr. arata kochi of the world health organization believes that with enough money malaria cases could be cut by 90 percent, but he believes that it would be very expensive to eliminate the remaining 10 percent of cases. he concluded that countries should not strive to eradicate malaria. source: the new york times, march 4, 2008 draw a marginal cost curve that is consistent with dr. kochis opinion as reported above. draw a marginal benefit curve that is consistent with dry. kochis opinion as reported above. draw a point to show the quantity of malaria eradicated that achieves allocative efficiency.

When the national economy goes from bad to better, market research shows changes in the sales at various types of restaurants. projected 2011 sales at quick-service restaurants are $164.8 billion, which was 3% better than in 2010. projected 2011 sales at full-service restaurants are $184.2 billion, which was 1.2% better than in 2010. how will the dollar growth in quick-service restaurants sales compared to the dollar growth for full-service places?

Russell's study compared gpa of those students who volunteered for academic study skills training and those who did not elect to take the training. he found that those who had the training also had higher gpa. with which validity threat should russell be most concerned?