What is the slope of x-Deez

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

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?

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl