For this case we must simplify the following expression:

We have that by definition of properties of powers that is fulfilled:

Then, rewriting the expression:

Answer:

2 x 5 x 11 Is it I think. What do you think?
Answer:

Step-by-step explanation:
The sum you are trying to understand is this.

Remember that in general when you have a geometric series
you have that
and that equality is true as long as
.
Therefore here we have
and 
Therefore we can use the formula and

Answer:
80 inches
Step-by-step explanation:
6 x 12 = 72 + 8= 80
Give brainliest please