SSA
Step-by-step explanation:
put name of triangle abc are same
If you mean 3(-x+1)+5:
There is a vertical stretch by a factor of 3. There is a reflection over the y axis. The graph moves left one unit and up by 5 units.
Hope this helps, and I provide an image in case it helps!
It is 70° because the other triangle has the same angle and it is labeled 70° in the other triangle.
Answer: 70°