Why no one wants to help

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

Ineed in figuring out this problem.

Which table represents points on the graph of h(x) = 3√-x+2?