Adding and subtracting polynomials

(3x ^ 3 + 4 - 2x) + (2x ^ 2 - x + 6)

Aline on the wall and a line on the floor are skew. always, sometimes, or never?

Answer question above and explain each step : )

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