It's the sum of a geometric sequence.
Let's rewrite it a bit:

And now let's calculate this sum
:

Now let's calculate the initial sum:

I believe this would be 12.45
hope this helps!
The sum of the equation is
and it can be determined by using addition and it can be determined by summation rule in the equation.
<h2>Given that,</h2>
Equation; 
<h3>We have to
determine</h3>
The sum of the equation.
<h3>
According to the
question,</h3>
To determine the sum of the equation following all the steps given below.
<h3>
Equation;

</h3>
The sum of the equation is determined by factorizing the equation,
Then,
The sum of the equation is,

Hence, The required sum of the equation is
.
For more details about Addition refer to the link given below.
brainly.com/question/25996972
Answer:
56 cubic meter
Step-by-step explanation:
Volume of a pyramid: V=(lwh)/3
So then 7*3*8/3= 7*8 =
56 cubic meter