Answer:
Step-by-step explanation:
The given series is
We want to write an expression that can be used to evaluate this series.
Since this is a geometric series, we use the formula for the sum of the first k terms.
From the given series the first term is and the common ratio is and k=8
We substitute the values to obtain:
Answer:
Ok I look now what
Step-by-step explanation:
Answer:
18
Step-by-step explanation:
I did my method that I was taught but if you do (-5) - (-2), you get 3. So you subtract 39 by the -21 to get 18.