What is the value of x ?

12

Step-by-step explanation:

Sum of angles on a straight line=180

10x - 20+6x + 8=180

Collect like terms

10x + 6x + 8 - 20=180

16x - 12 = 180

Add 12 to both sides

16x - 12+12=180+12

16x=192

Divide both sides by 16

16x/16=192/16

X=12

1 3 5

step-by-step explanation:

i took the test: )

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