For Exercises 42–44, refer to the following. The body mass index (BMI) is the basis for the National Heart, Lung, and Blood Institute’s weight guidelines. BMI is body weight (in kilograms) divided by the square of height (in meters). A BMI of 25 through 29 is considered “overweight”; a BMI of 30 or over is considered “obese.” Some 55% of American adults have a BMI of 25 or above. (Note: BMI is not a useful measure for young children, pregnant or breastfeeding women, the frail elderly, or very muscular people.) For practice with this concept, calculate your own BMI.