Select the two expressions that are equivalent to each other. A. -1/4
B. -0.4
C. 1/-4
D. (-1) ÷ (-4)
E. 4/-1

Me because some of question i don’t understand

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?

Consider the set of all four-digit positive integers less than 2000 whose digits have a sum of 24. what is the median of this set of integers?