Solve a system of linear equations to find the value of x and y

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?

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

Olive's solar powered scooter travels at a rate of 30 miles per hour. what equation can she use to calculate her distance with relation to the time she traveled? h=hours m=miles 1. h=m+30 2. m=30h 3. m=h+30 4. h=30m