Marco's football team gained 13 yards on their first play, but lost 7 yards on the second. How many yards did they gain between the two plays?

Someone . me. compound probability

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

Which graph represents the equation y =4x