A pharmaceutical company has two production plants that produce the same medicine. If x and y are the number of units produced in each plant respectively, the total revenue for the product is given by R (x, y) = 157x + 171 y - 7x^2 - 5xy - 3y^2 dollars. When x = 14, y = 13, find the marginal revenue (the rate of change of the revenue with respect to the number of units) for both plants.?

Compare the sources of consumer credit 1. consumers use a prearranged loan using special checks 2. consumers use cards with no interest and non -revolving balances 3. consumers pay off debt and credit is automatically renewed 4. consumers take out a loan with a repayment date and have a specific purpose a. travel and entertainment credit b. revolving check credit c. closed-end credit d. revolving credit