GOOD MORNING!!! How is everyone?

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 area of a triangle with vertices at (-3 3) (-3,2) and (1,2)?

3x = 729 solve for x plz . it's urgent. will mark