tolong dijawab no7-10

7. Un → 2 jam = 120 menit
120 ÷ 15 = 8 + bilangan pertama = 9
U9 = a × r^n-1
= 30 × 2^9-1
= 30 × 2^8
= 30 × 256
= 7.680 (D)
8. (C). P dan S
9. (D). (-7,-4)
10. (C). Layang-layang