john used 1 3/4 kg of salt to melt the ice on his sidewalk. he then used another 3 4/5 kg of salt, if he originally bought 10 kg of salt, how much does he have left?

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

Ametalworker has a metal alloy that is 30? % copper and another alloy that is 55? % copper. how many kilograms of each alloy should the metalworker combine to create 90 kg of a 50? % copper? alloy?

Solve the equation by completing the square. x^2+2x=17