mirabellexoxo mirabellexoxo

17-09-2019
Mathematics

contestada

help please, and thank you.

help please and thank you class=

Respuesta :

mathstudent55 mathstudent55

17-09-2019

Answer:

m<ABC = 41

m<DBC = 39

Step-by-step 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

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