1. Concavity: A certain graph is decreasing, but at an increasing rate. Discuss its concavity. How would the concavity change if it were decreasing, but at a decreasing rate? 2. Getting a formula:...

1. Concavity: A certain graph is decreasing, but at an increasing rate. Discuss its concavity. How would the concavity change if it were decreasing, but at a decreasing rate?

2. Getting a formula: You currently have $780 in your bank account, which pays no interest. You withdraw $39 each week. Find a formula for the balance B, in dollars, in the account after t weeks.