It would be 25 because you have to add all the sides around the quadrilateral because you are looking for the perimeter which is adding of all the sides and when you add all the sides you get 25.
She bought it at a 15% discount because 15 percent of 40 is 6 and 40-6=34
The correct answer would be C
The students in math class use square tiles to make arrays. If they
- use 8 (8=1·2·2·2) tiles, then they can form arrays of the length in 1 tile, 2 tiles, 4 tiles and 8 tiles;
- use 9 (9=1·3·3) tiles, they can form arrays of the length in 1 tile, 3 tiles and 9 tiles (one array less).
So, you can conclude that Celia is correct.
