What triangle congruence theorem could be used to prove that these triangles are congruent?

What should be done to solve the equation? x+14=21 add 14 to both sides of the equation. subtract 14 from the left side of the equation. add 14 to the left side and subtract 14 from the right side of the equation. subtract 14 from both sides of the equation.

In what organelle does photosynthesis take place?

Someone me! if you’re smart you can solve this!