I need help i honestly dont get this​

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?

Adam used 1072.4 gallons of water over the course of 7 days. how much water did adam use, on average, each day?