Answer:
11
Step-by-step explanation:
(10 + 3) + 6 = 10 + __
13 + 6 = 10 + __
21 = 10 + __
21 - 10 = 11
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Answers & Comments
Answer:
11
Step-by-step explanation:
(10 + 3) + 6 = 10 + __
13 + 6 = 10 + __
21 = 10 + __
21 - 10 = 11