I need yo know the work of how to get the answer for the above question and a GOOD similar problem. Please please please this is late work and I'm averaging a C in this class if I don't turn it in soon.

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

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?