What is the value of a1 of the geometric series?

12

Step-by-step explanation:

The a1 value is the value of the first term.  Then, each additional term is determined based on a geometric calculation.

In this summation, you can see the first term before the parenthesis onto which is applied the geometric progression variable.

We see the geometric variation factor is -1/9, that is what will be used to determine the next terms.

The answer is 12 because 12(-1/9) is equal to 12

So your answer would be 12

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step-by-step explanation:

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