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

Write the rational number in lowest terms 99/-15

Aschool had an election where the candidates received votes in the ratio 1: 2: 3. if the winning candidate received 210 votes, how many total people voted in the election?

If the altitude is drawn to the hypotenuse of a right triangle, then the two triangles formed are similar to the original triangle and to each other. which set of triangles shows the similar triangles created by the altitude in the diagram?