1. SECTION 3.8 RATES, RATIOS, AND PERCENTS OBJECTIVES: USE RATES AND RATIOS TO MODEL AND SOLVE REAL LIFE PROBLEMS USE PERCENTS TO MODEL AND SOLVE REAL LIFE PROBLEMS

2. TERMS Rate of a per b:the relationship of two quantities a and b that are measured in different units Unit rate: a rate per one given unit Ratio of a to b: the relationship of two quantities a and b that are measured in the same unit.

3. EX: FIND THE UNIT RATE 1.In the US in 1996, $913 billion was spent on Medical Care. Find the cost per person, assuming the US population in 1996 was about 266 million. 2.In the US in 1996, $602 billion was spent on Transportation. Find the cost per person, assuming the US population in 1996 was about 266 million.

4. EX: SOLVE THE APPLIED PROBLEM 3.You are visiting Canada and you want to exchange $150 for Canadian dollars. The rate of currency is 1.4 Canadian dollars per United States dollar. You want to find how many Canadian dollars you will receive. 4.When you leave Canada you find that you have 15 Canadian dollars left. You want to find how much you can get in United States dollars. The rate of currency exchange is now 1.3 Canadian dollars per U.S. dollar.

5. EX: SOLVE THE APPLIED PROBLEMS 5.You tested a sample of 100 packages from a shipment of 6000 packages. You found that 70 packages were under weight. Estimate the number of packages that will be under weight. 6.What percent of the votes for Bob Dole came from California? VotesCA Votes Dole39,197,4693,828,380

6. EX: SOLVE THE APPLIED PROBLEMS 7.About 74% of water used in houses is used in bathrooms, about 5% in kitchens, and about 21% in other places. About 9 gallon is used in the kitchen each day. Estimate the total gallons used each day. 8.About 78% of the air is nitrogen, 21% is oxygen, and 1% is carbon dioxide and other gases. In 450 mL of air, how much is oxygen?

7. P. 183 12 – 18 EVENS, 20, 21, 24, 26, 27, 30 – 32 ALL, 34, 35, 39 – 41 ALL, 56, 58