Make two straight angles AOB and CDE compare them

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?

Find the solution to this system 2,1 1,-2 1,2 -1,2

Which rotation about its center will carry a regular hexagon onto itself