16
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composite numbers between 11 and 21:12 14 15 16 18
The prime numbers between 10 and 21 are 11, 13, 17, and 19.
Four. The prime numbers between 10 and 21 are 11, 13, 17, and 19.
21 over 11 = 21/11 in fraction
Distance2 = (21-9)2 + (16-11)2 = 169 and the square root of this is the distance which is 13 units