Some research suggests that first born children may have higher iq scores than their later born siblings. do first-born identical twins have higher iq scores than their second-born sibling? data from a 1998 study were analyzed to determine whether first-born identical twins have higher iq scores than their second-born siblings. ten pairs of adult identical twins were assessed and their full scale iq scores were calculated.

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