Quadrilateral dabc was dilated to form quadrilateral efgh. what scale factor was used in the dilation?

What is the approximate circumference of the circle shown below?

When i add money am i supposed to make it like this 7+12 or 7.00+12.00 because i got 19 dollars for my answer

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?