Polynomial

1. 15a + 14a =29a

2. 10.5a + 8a =18.5a

3. 28a - 5a =23a

4. (2a + 12a)- 9a =5a

5. 36a / 2a * 15 - 3 =267a

6. 122a / 2a * 36 =2196a

7. (85a + 62a)-(23a / 8a) =15.5a

8. (94a * 52a) / 20a =244.4a

9. (56a * 65a) + (34a * 43a) =5102a

10. 80a - (90a - 30) =-20a

Tessellation

surface area (Library)

Method: We use our step to measure the width and side. Then, we plus and multiply like the formula.

area of floor  = 72 x 30 = 2160

                       = 9 x 6 = 54

                       = 8 x 12 = 96

                       = 6 x 7 = 42

        windows = 72 x 10 = 720

               wall = 10 x 30 = 300

Total: 6,744