Question

Find m What is the m m

Answer 1

m<DBC=120°

Explanation:

2x+x+90=180

3x=180-90

3x=90

x=30

m<DBC=x+90=30+90=120

Answer 2

120

Explanation:

ABC is a straight line so it is equal to 180

ABC = ABD + DBC

180 = 2x + x+90

Combine like terms

180 = 3x+90

Subtract 90 from each side

180-90 = 3x+90-90

90 = 3x

Divide each side by 3

90/3 = 3x/3

30 =x

We want to find DBC

DBC = x+90

= 30+90

= 120