If x+yi/i = 8+ 10i, where x and y are real, what is the value of (x + yi)(x - yi)?
A 164
B 150
C. 75
D. 100

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Drag the tiles to the boxes to form correct pairs. not all tiles will be used. match each set of vertices with the type of quadrilateral they form

Ineed with number 6 , explain how to get 1978