The answer is 8lbs because 3/2 is 1.5 and 12/1.5 is 8
The slope is 8.
(5,40) (10,80)
80-40=40
10-5=5
40/5=8
<u>Understanding:</u>
The sum of a geometric series is,
, with a being the start point and r is the common ratio. We can also use the following formula to make life easier
, a is your start point, r is the common ratio, and n is the number of terms, which in our case is S7.
<u>Solution:</u>
Our start point is 1,
,
The common ratio is 5,
,
And finally, the number of terms is 7,
.

The answer is [A] 19531.