Use the chart below to answer the questions: country population (1997 estimate) area (square km) u. s. 272,648,000 9,364,520 denmark 5,248,000 42,077 ghana 18,339,000 237,533 which of these countries has the greatest population density? which has the least? how can you tell? provide an explanation and proof for your answer to receive full credit.

Aschool typically sells 500 yearbooks each year for 50 dollars each. the economic calls does a project and discovers that they can sell 100 more yearbooks for every $5 decrease in price. the revenue for yearbook sales is equal to the number of yearbooks sold times the price of the yearbook. let x represent the number of $5 decrease in price. if the expression that represents the revenue is written in the form r(x)=(500+ax)(50-bx). to maximize profit, what price should the school charge for the yearbooks? what is the possible maximum revenue? if the school attains the maximum revenue, how many yearbooks will they sell?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

What is the result of adding the system of equations? 2x+y=4 3x-y=6