I need help with margin

@ safari File Edit View History Bookmarks Window Help & SatMar9 3:00PM ng.cengage.com Homepage - ECO-201-T4890 Microeconomics 24EW4 2% MindTap - Cengage Learning Cov R '..Q CENGAGE ' MINDTAP Q Search this course Januar; Module One Quiz @ X 5. A decision at the margin (el [Ny Suppose that Valerie is a diligent hard-working third-year college student. One Friday, she decides to start the day by working through 300 practice problems to study for the econometrics class. Using a table to track her progress throughout the day, she notices that as the hours pass, it takes her ORDERS longer to solve the problems. RENTALS Time Total Problems Solved 7:00 AM 0 COURSES v 8:00 AM 120 9:00 AM 210 10:00 AM 270 11:00 AM 300 Study tools Activity Frame College Success Tips ) Use the table to answer the following questions. Career Success Tips The marginal, or additional, gain from Bella's second hour spent working, from 8:00 AM to 9:00 AM, is problems. @ 0 Help The marginal gain from Bella's fourth hour spent working, from 10:00 AM to 11:00 AM, is problems. | E_. SIGN O The following week, Bella's econometrics faculty advisor gives her some advice. In all their years of teaching they claim to observe that working on 75 multiple choice questions boosts a student's test score by about the same amount as spending an hour reviewing lecture notes. For simplicity, assume students are able to review lecture notes at a constant pace during each hour spent studying. @& Safari File Edit View History Bookmarks Window Help & SatMar9 3:00PM ng.cengage.com Homepage - ECO-201-T4890 Microeconomics 24EW4 4% MindTap - Cengage Learning N R .