Chapter 5, Problem 5.23AC

2. A group of artists have decided to produce hand-drawn cards for Valentine's Day, and donate the money to the American Heart Association. The artists plan to produce ink drawings and watercolors. They have volunteered to spend 120 hours of preparation time, and 60 hours of packaging time. It takes 0.3 hours to prepare each ink drawing, and 0.5 hours to prepare each watercolor. It takes 0.2 hours to package each of the cards. Let a represent the number of ink drawings. Let y represent the number of watercolors. Which set of inequalities represents this situation?

2. Ms. Liu tells you that on each weekday, visitors return to her website an average of twice, and on weekends, visitors return four times per day. She adds that these two groups of users are different. She wants to know how many unique visitors (i.e., the number of users who visit the site, regardless of the number of their visits) visit her site on weekdays and weekends. Please note that if a particular visitor comes to the site every day or several times a day, it still counts as only one visit. A B D Unique Visitors 1 Visits # of Visits # of Days 2

Kentville, a community of 10,000 people, resides next to a krypton mine, and there is a concern that the emission from the krypton smelter have resulted in adverse effects. Specifically, Kryptonosis seems to have killed 12 of Kentville’s inhabitants last year. A neighboring community, Lanesburg, has 25,000 inhabitants and is far enough from the smelter to not be affected by the emission. In Lanesburg, only three people last year died of Kryptonosis. Given that the number of deaths in Kentville and their causes last year were: Heart attack=7 Accidents=4 Kryptonosis=12 Other=6    What is the risk of dying of Kryptonosis in Kentville relative to non-contaminated locality?What is the risk of dying of Kryptonosis in Kentville relative to deaths due to other causes? How many times the chance of dying of Kryptonosis compared to dying of accidents ? How many times the chance of dying of Kryptonosis compared to Other causes?