No, 0.4 kilometers and 0.25 kilometers are not more than a kilometer instead, they are 400 meters and 250 meters
-3/4 because it's negative and also you can work it out by using rise/run
Well D. represents -1/4 because there are 4 parts that make up -1, and D. is right before 0, so that makes it -1/4.
With my same explanation as before, you have gotten the second one correct; well done! =D
Well, I hope I helped! =D
The ratio is 1/2in to 5ft, or 1in to 10ft. That means for every 1 inch there will be 10ft. Since the room in the drawing is 2 inches long, the actual length of the room will be 20 feet long.
Given is the number of science fiction books = 48
Let the number of mystery books be = x
Let the number of biographies be = y
Ratio of the number of mystery books to the number of science fiction books is 4:3 so 
=
Ratio of the number of science fiction books to the number of biographies is 4:5 so 
=
Hence there are 48 science fiction books, 64 mystery books and 60 biographies.
So total number of books are = 
