[tex]\begin{gathered} r-82<-164 \\ \text{note that when dividing by a negative number,} \\ \text{the inequality sign inverts and turns the other way} \\ \text{Divide both sides by -82} \\ r>2 \\ Therefore\text{ in interval notation} \\ r(2,\infty\rbrack \end{gathered}[/tex]
All the values of r are greater than 2 (2 is not inclusive) and goes on till infinity
