3 Pieces Fusible Interfacing Non-Woven Lightweight Polyester Interfacing (Black, 20 Inch x 3 Yards)

Is this 3 pieces 3 yards long each for a total of 9 yards

Would you use this to applique a lot of pieces up to 4 1/2", then hand-quilt them? Would this be enough?

Is this suitable as a diffuser for a DIY lightbox in photography?

Is this fusible on both sides?