9. Structure in expressions

1.  

Question 1 of 15

2.  

Question 2 of 15

3.  

Question 3 of 15

4.  

Question 4 of 15

5.  

Question 5 of 15

6.  

Question 6 of 15

7.  

Question 7 of 15

8.  

Question 8 of 15

9.  

Question 9 of 15

10.  

Question 10 of 15

11.  

Question 11 of 15

12.  

Question 12 of 15

13.  

Question 13 of 15

14.  

Question 14 of 15

15.  

Question 15 of 15