Amelia wants to buy 6 sausage Rolls. Each sausage rolls costs 84p. Amelia pays with a £20 note. Work out how much change Amelia will get from £20.

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

Me because some of question i don’t understand

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?