Could someone plz me..it's easy but i'm terrible at math sooo

The product of two negative rational numbers is always zero sometimes zero never zero

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

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?