If adams high and jefferson high both lose 100 students each, madison high's population stays the same, and both lincoln high and grant high gain 200 students each, what happens to the mean of the population of all 5 schools?

This race was first held in 1953 on august 16th. every decade the race finishes with a festival. how many years is this?

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions. a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0