Some one please help with my geo test

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

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?

The owner of the plant nursery where you were tells you to fill 350 ml bottles from a 30 l from a fertilizer