When a number is decreased by 43%, the result is 20. What is the original number

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

Apath 3 m wide runs around the inside of a square park inside 60 m. find the area of the path. pls

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.