Answer:

Step-by-step explanation:
We have a geometric sequence with:
,
, and 
Where
Sn is the sum of the sequence
r is the common ratio
is the first term in the sequence
n is the number of terms in the sequence
The formula to calculate the sum of a finite geometric sequence is:

Then:

Now we solve for 


Answer:32-10x
Step-by-step explanation:
The answer is C. Using ASA postulate, prove that triangles PQS and PRS are similar triangles
Their are 16 logs the stove burn in 8hours
68-40=28
28/4=7
therefore, 7 is your answer
(Hope it helps my friend ^_^)