Concept explainers
For Exercises 29-48, use a variation model to solve for the unknown value.
The amount of a pain reliever that a physician prescribes for a child varies directly as the weight of the child. A physician prescribes 180 mg of the medicine for a 40-lb child. (See Example 3)
a. How much medicine would be prescribed for a 50-lb child?
b. How much would be prescribed for a 60-lb child?
c. How much would be prescribed for a 70-lb child?
d. If 135 mg of medicine is prescribed what is the weight of the child?
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Precalculus
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