<u>1/2 value</u><u> can be used as the </u><u>common ratio</u><u> in an explicit formula that represents </u><u>the sequence.</u>
Definition of sequence -
- The following of one thing after another; succession. order of succession: a list of books in alphabetical sequence.
- A continuous or connected series: a sonnet sequence. something that follows; a subsequent event; result; consequence.
A sequence that progresses geometrically has the first term as 12.
Each number is the previous number divided by 2.
so the sequence will be 12, 6, 3, 1.5...........
Explicit formula of a geometric sequence is given by

Where
= nth term of the sequence
a = first term
r = common ratio
and n = number of term
In this sequence common ratio = 
= 6/12
= 1/2
Therefore, common ratio will be 1/2.
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Answer:

Step-by-step explanation:
Let the first number is x1 and other number is y1 then

Therefore


also there sum is
....Eq(1)
Putting the value of y1 in the previous equation
........Eq(2)
Differentiate the the Eq(2) with respect to x1 we get



Putting the value of X1 in Eq(1) we get

So 
When a number is next to a letter like so: 3m You would multiply, so
3 ~ 2 = 6 then solve the problem like this
11-3m= ?
3~2=6
6-11=5
so 11-3m=5
Hope this helps! :)