(m • n) • p=m • (n • p)
what property is this

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

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

Bring the fraction a/a-4 to a denominator of 16-a^2