Use Direct and Inverse Variation · Exercise 30
Write an inverse variation equation to solve the following problems.
Paul, a dentist, determined that the number of cavities that develops in his patient’s mouth each year varies inversely to the number of minutes spent brushing each night. His patient, Lori, had 4 cavities when brushing her teeth 30 seconds (0.5 minutes) each night.
ⓐ Write the equation that relates the number of cavities to the time spent brushing.
ⓑ How many cavities would Paul expect Lori to have if she had brushed her teeth for 2 minutes each night?
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OpenStax, Elementary Algebra 2e · §8.9 Use Direct and Inverse Variation · Exercise 30
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