Need to find x. i need to find the leg of the triangle

Autility company burns coal to generate electricity. the cost c(p), (in dollars) of removing p percent of the some stack pollutants is given by c(p)= 85000p/100-p a) find the cost to remove 30% of the pollutant b) find where the function is undefined

When you answer this can you explain

Which system of linear inequalities is represented by the graph?