198round to the nearest tens and hundreds

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?

Percent increase and decrease. original number: 45 new number: 18

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3