Find the missing angle?

Describe the relationship between the angles of similar triangles and the sides of similar triangles

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

Find │7│. a. 1 over 7 b. –7 c. 7 asap i always mark brailiest who me so