Please answer 1-8 godbless​

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

What is the pattern in the values as the exponents increase?

If the measure of xyz is 81 what is the measure of yz