What is the slope of the line that passes through the points M (4,-5) and N (0, -8)? A.) -3/4
B.) 13/4
C.) -4/3
D.) 3/4

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?