tolong jwb no 9dan10beserta caranya ya makasih

no 9 pada gambar diatas

nomor 10 =
1. deret geometri
a = 100
r = 2
n = 4jam : 30mnit
= 4jm : 0,5jam
= 8

Un = a(r^n - 1) / (r-1)
= 100.(2^8-1) / 2-1
= 100.(256-1)
= 100 . 255
= 25500