Which variable expression represents the word phrase?

the sum of 12 and the quotient of 9 and a number

12−(9÷y)
9 + (12 ÷ y)
12 + (9 ÷ y)
12−9y

The rumpart family is building a new room onto their house. the width of the new room will be 16 feet. the length of the room will be 4% greater than the width. write an expression to find the length of the new room. what will be the area of this new room?