Which equation is an identity?

–3y + 3 = –3y – 6

3w + 8 – w = 4w – 2(w – 4)

9 – (2v + 3) = –2v – 6

7m – 5 = 8m + 7 – m

Points d and e are midpoints of the sides of triangle abc. the perimeter of the triangle is 48 units. what is the value of t? ο ο ο ο 7t +

Solve for x, y, and z. show all steps.

Which best explains why this triangle is or is not a right triangle?