On January 1,2014, there were approximately 10,200 tons of garbage in the
Chicago River. The river will be officially
marked as environmentally safe when there
are less than 5,200 tons of garbage. Each year
since then, clean-up efforts have been able to
remove 350 tons of garbage. If t represents
the number of years since January 1", 2014,
which of following inequalities can be used to
determine when the Chicago River is
environmentally safe?