Oksana is working to solve the equation 13x = −14x - 10.1.      
add 14x to both sides: 14x + 13x = −102.
find a common denominator: 312x + 412x = −103.    
combine the terms: 712x = −10
what should she do

divide both sides by 7/12

Step-by-step explanation:

Divide both sides by 7/12

Reason: I agree with the other answer.

19.side- angle- side

20. angle- side- angle

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