Tell me on how they got that answer for number 11

First we set the chicken dish as the variable x and the beef dish as the variable y.

x + y = 250

5x + 7y = 1500

We then solve for x on one of the equations.

x = 250 - y

Then we plug this into the second equation.

5(250 - y) + 7y = 1500

1250 -5y + 7y = 1500

2y = 250

y = 125

Karina served 125 beef dishes.

We then plug this value into x + y = 250 to find x.

x + 125 = 250

x = 125

Karina served 125 chicken dishes.

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

here is the

mark brainliest pl