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?
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Elementary Algebra 2e · §8.9 Use Direct and Inverse Variation · Exercise 30
No hints for this one.
Check your full solution
Upload photos of your handwritten work or a PDF, and Lemma will read it and tell you whether it's right — and where it first goes wrong if not.