<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.
Step-by-step explanation:
akajahsjallamamsjskdkldd
Answer:
x
^2
−
2
y
^2
−8
x
y
Step-by-step explanation:
Answer:
The answer is option B, x = 4.2
Answer:
1780
Step-by-step explanation:
product means multiply
20x89=1780
