Can someone answer this for me also I’m being timed so hat would be great if you were to answer quickly thanks:)

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

Find the total area for the regular pyramid ( follow the answer set up in the picture)

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42