Help i dont reamember how to do this plz

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?

Choose the more precise measurement. 26.4 cm or 8.39 cm

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?