Answers

2016-07-20T20:25:41+08:00
A sub 7 = 3 1/2. (1, 1 1/2, 2, 2 1/2 , 3, 3 1/2)
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a sub 1 is equal to the ratio which is 1/2. Therefore, a1 = 1/2
2016-07-20T20:44:35+08:00
You can get the answer using this formula:

an = a1(r)^n-1

a7 = 1/2(1/2)^7-1

a7 = 1/2(1/2)^6

a7 = 1/2(1/64)

a7 = 1/128
1 5 1