Question

Help please, and thank you.

Answer 1

m<ABC = 41

m<DBC = 39

Explanation:

m<ABC + m<DBC = m<ABD

m<ABC = 7x - 8

m<DBC = 5x + 4

m<ABD = 80

7x - 8 + 5x + 4 = 80

12x - 4 = 80

12x = 84

x = 7

m<ABC = 7x - 8 = 7(7) - 8 = 49 - 8 = 41

m<DBC = 5x + 4 = 5(7) + 4 = 35 + 4 = 39

m<ABC = 41

m<DBC = 39