tolong jawab no 15 sampai 19 pakai cara.............

15. 9/4+17/12+2/3
=27/12+17/12+8/12
=52/12
=13/3 → 4 1/3 (A)
16. Sebelum jam 7 = 168x3/4 = 126
Tepat waktu = 168x1/8 = 21
126+21 = 147
Terlambat = 168-147 =21 (C)
17. 3,84.000.000
= 3,84 x 10 pangkat 8 (A)
Karena dibelakang koma ada 8 angka
18. -11/8+23/4
=-11/8+46/8
=35/8 → 4 3/8 (B)
19. 14/3+3/2+15/4
=56/12+18/12+45/12
=119/12 → 9 11/12 (C)