Which set of ordered pairs (x, y) could represent a linear function. Please need help which letter is it

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 quadric regression equation that fits these data

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?