2 fifths divided by 1 over 10?

What are the values of , , m∠abd and m∠dbe in the given figure? explain or show your work

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

Use circumcenter theorem to solve for the given values