It says that I should add fractions with unlike denominators.

If there are different denominators in a fraction you have to multiply the denominators by their least common factor(lcm).

Example:

2/4 + 5/8=

We can multiply the 4 and the 2 by 2 to get 4/8.

2/4= 4/8

Then, you add normally.

4/8+5/8= 9/8

And remember you cant add the denominator it stays the same, that is why we made them the same.

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