Any one explain me the answer

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?

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

Find the circumference of a pizza with a diameter of 10 inches round to the nearest tenth