Unformatted text preview: EXAMPLE 7 Solving a Combined Variation Problem
Body mass index (BMI) is used to assess whether a person's weight is healthy. A BMI
from 19 through 25 is considered desirable. BMI varies directly as an individual's
weight in pounds and inversely as the square of their height in inches.
A person who weighs 118 lb and is 64 in. tall has a BMI of 20. (BMI is rounded
to the nearest whole number.) Find the BMI of a man who weighs 165 1b and is 70 in.
tall. (Source: Washington Post.)
Let B = BMI, w = weight, and h = height. Write a variation equation.
BMI varies directly as the weight.
BMI varies inversely as the square of the height....
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- Spring '19
- Mass, Body mass index