tolong dijawab no 1 sampai 3

1. -15 +23 -(-12)-38 = 8 + 12 - 38 = -18
    jawabannya b.-18

2.-12- a
   a = 60 artinya -12 - 60 = -72

3 48% = a.12/25
   12/25 = 12x4/25x4 = 48/100 = 48%