For which pairs of functions is (f°g)(x)=x

∆red ≅ ∆ by rule will give brainiest if possible

If you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no. explain your mathematical thinking

25 ! what is the value of x? enter your answer in the box. x =