15 7.5 2 July 8, 2019 16 32 64 128 15 7.5 20 15 7.5 25 15 7.5 27 15 7.5 2d 1 )= 7.5 Sqrt 15 2 7.5 2 26 15 7.5 7.5 23 15 22 15 7.5 24 15 7.5 Npe 15 7.5 2 1