14 Chapter 1 Whole Numbers Estimated Number of Cases of HIV/AIDS in the United States for Selected Years Example 10 Number of Cases 40,000 30,000 20,000 10,000 0 1 2 3 Year 26,673 9,775 27,182 9,842 31,518 10,977 Men Women Source: Centers for Disease Control Figure 1-3 Solution: The question asks for the number of HIV/AIDS cases for women only.Therefore, add the values corresponding to the pink bars in the graph. 1 7 1 5 There were 30,594 HIV/AIDS cases among women for years 1–3. 5. Perimeter One special application of addition is to find the perimeter of a polygon. A polygon is a flat closed figure formed by line segments connected at their ends. Familiar figures such as triangles, rectangles, and squares are examples of polygons. See Figure 1-4. 2 9 2 ,7 9,842 10,977 30,594 Triangle Rectangle Square Figure 1-4 Answer 13. $1720 The perimeter of any polygon is the distance around the outside of the figure. To find the perimeter, add the lengths of the sides. Skill Practice 13. Samira’s monthly expenses are summarized in the pie graph. Find the sum of her expenses. Monthly Budget Car $340 Rent $660 Food $300 Other $250 Utilities $170 Solving an Application Problem Involving a Graph The bar graph in Figure 1-3 gives the estimated number of cases of HIV/AIDS in the United States for three selected years. The pink bars in the graph represent the values for the number of women. The blue bars in the graph represent the values for the number of men. Find the total number of HIV/AIDS cases for women for the years 1–3.
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