Step-by-step explanation:
common ratio r = 98/140
first term a = 140
geometric sequence formula is an = ar^(n-1)
an = 98^(n-1)
where n is the number of terms in the sequence
9.16x10^6 = 9160000
8.05x10^8 =805000000
805000000
- 9160000
__________
795840000
795840000 = 7.9584x10^8
If Eli spends $392 for 8 gigabytes of memory, then

, where g is a gigabyte of memory. All you have to do is to reduce the equation. In this case, divide both sides by 8 to get

. So the cost of 1 gigabyte of memory is $49.
<span>4^2 x 4^8 = 4^(2+8) = 4^10
hope it helps</span>