Plz help no LINKS plz

At the newest animated movie, for every 9 children, there are 4 adults. there are a total of 39 children and adults at the movie.

When you answer this can you explain

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