Drag the tiles to the correct boxes to complete the pairs. Add each pair of monomials and match it to the correct sum.

-15u3 + 5u3
10u3 + (-5u3)
10u3 + 5u3
5u3 + (-10u3)

How do you use the elimination method for this question? explain, because i really want to understand!

Which statement is true? n is a point of tangency on circle p. pt is a secant of circle p. is a secant of circle p. vu is a tangent of circle p.

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.