Question

Minta tolong bantu jawab ini :)
No 49-51 yah? :)

Answer 1

R=u7/u4 = 1/16 : 1/2 = 1/8
= √1/8
=1/2
u4= ar3
1/2 = a.1/2 pangkat 3
4 = a
s8= a(rn-1)/ r-1
= 4(1/2 pangkat 7-1) / 1/2-1
=4(127)/ -1/2
=-508/ 1/2

51) r=2
a=2
s5?
s5= a(rn-1) / r-1
= 2(15) /1
=30 cm