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Answer:
13
Step-by-step explanation:
there is a rule that says that if you add any 2 sides, it should be more than the third. 9+21 is greater than 13. 21+13 is greater than 9. 13 is the only number which if you add 9 to it it will be greater than 21. 12 will equal 21, but it still wont work.
hope this helps :))
There are many like
1(10)+10-1=19
18+1=19
30-11=19
<span>15+4=19</span>
It is C parallelogram and rumbus
Answer:
I'm not ok. that is too expensive
Step-by-step explanation: