1. B. 2.C 3.C. these answers are all correct.
Its b because a rational number repeats
Well
21-8= 13
63-21=42
42-21=21
13*2=26 t
There is 26 non woodwind instruments
The answer is C. Since 414 is an even number, it is divisible by 2. Since 115 ends in 5, it is divisible by 5. And 273 is divisible by 3 (if you add all the digits and that number is divisible by 3, so it the originals. 2+7+3=12 12/3=4)