PLEASE ANSWER ALL OF THESE QUESTIONS, WORTH 25 POINTS WITH STEPS/EXPLAIN

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 celsius temperature that is equal to 94 degrees fahrenheit using the formula f=9/5 c+32

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36