If using the method of completing the square to solve the quadratic equation x^2+8x-4=0 ,which number would have to be added to "complete the square"?

Simplify (1/2)4th power a. (1/16) b.(1/8) c.(1/4)

Tamar is measuring the sides and angles of tuv to determine whether it is congruent to the triangle below. which pair of measurements would eliminate the possibility that the triangles are congruent

If set d is not the empty set but is a subset of set e, then which of the following is true? d ∩ e = d d ∩ e = e d ∩ e = ∅