Colby loves to download new music. he originally had 34 songs but plans to purchase 6 new songs each week. he wants to know how many songs he will have after 100 weeks. which equation should he use?
a100 = 34 + 6(100 + 1)
a100 = 34 + 6(100 − 1)
a100 = 100 + 6(34 − 1)
a100 = 100 + 6(34 + 1)

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.