What is the median? 3,4,3,5,6,4,1,10,8​

Galen sold tickets of his church’s carnival for a total of $2,820. children’s tickets cost $3 each and adult tickets cost $5 each. the number of children’s tickets sold was 30 more than 3 times the number of adult tickets slod. how many children’s ticket and how many adult tickets did he sell?

What is the the greatest common factor ?

Y+ 2/y is it a polynomial in one variable or not? and if so, why?