Super confused me find d, x, & c

What is the value of x in the equation 6(x + 1) – 5x = 8 + 2(x – 1)?

What rotation was applied to triangle def to create d’e’f’?

What is the arc length of the subtending arc for an angle of 72 degrees on a circle of radius 4? o a. 8a oc. 16 t d. 8