Anyone need help 15 points ??? ASAP

Based on the figures as marked, /\rqs = —

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 do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)