How do you find inital value on a graph I forgot how

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

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?

What is 1.5% of 120 or what number is 1.5% of 120