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

1: -2 3/4, -2 1/2, -14, 0, 3, 8 1/3

2: -4, -3, -2 1/2, -2 1/4, 3 1/4,

step-by-step explanation:

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq