9 + 3

(a)  

9 + 4

(a)  

9 + 7

(a)  

7 + 9

(a)  

10 + 1

(a)  

10 + 2

(a)  

10 + 3

(a)  

10 + 8

(a)  

8 + 10

(a)  

8 + 3

(a)  

8 + 4

(a)  

8 + 5

(a)  

8 + 9

(a)  

9 + 8

(a)  

7 + 4

(a)  

10 + 5

(a)  

6 + 5

(a)  

7 + 5

(a)  

9 + 5

(a)  

5 + 9

(a)  

10 + 6

(a)