under 18 would be 17 and under, therefore not including 18 year olds. obviously they are not 19 yet either, so they wouldn't fall into either category, therefore they may be unsure of what to answer.
same with 65 year olds; they are more than 64 year old, but not yet /over/ 65, therefore they would not fit into either category either.
Honestly I’m not sure♀️ like it depends on what type of survey you’re trying to give. I’m 17, I don’t believe answering a survey would be so difficult to my age rank. Therefore, I believe 64 and 65.
For a rational number to have a terminating decimal expansion q should be in the form 5^m and 2^n or both. If q is not in the form of either then it is a non terminating recurring decimal expansion
