I need to know what is the m< DBC?

120

Step-by-step explanation:

The sum of the angles is 180 since it forms a straight line

2x+ x+90 = 180

Combine like terms

3x +90=180

Subtract 90 from each side

3x+90-90=180-90

3x= 90

Divide each side by 3

3x/3 = 90/3

x = 30

We want angle DBC = x+90

                                   = 30+90

                                   =120

Solution,

2x+X+90=180° ( sum of angle in straight line)

or,3x+90=180°

or,3x=180-90

or,3x=90

or,X=90/3

X=30

Value of X is 30°

Again,

Replacing value,

<DBC=X+90°

= 30°+90°

= 120°

Hope it helps

Good luck on your assignment

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