Respuesta :

Answer:

120

Step-by-step explanation:

First, you notice that both the angles add up to 180 degrees because it is a straight line.  Therefore, 2x+x+90=180.  Now you have an equation to solve!  Subtract 90 from both sides and combine like terms.  3x=90.  Therefore, x=30.  Now you plug x back in to find out m<DBC.  DBC=x+90 which is 30+90= 120.  

jeb199
(2x)+ (x+90) = 180

3x + 90 = 180

180-90 = 90

3x = 90

x = 30

angle DBC = (30)+90

angle DBC = 120 degrees

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