Final answer:
The sum of the first 8 terms of a sequence An using sigma notation is represented as Σ from i=1 to 8 of Ai. The specific expression cannot be simplified without the formula for the nth term of the sequence.
Step-by-step explanation:
The student is asking how to represent the sum of the first 8 terms of a sequence An using sigma notation. The sigma notation for the sum of the first 8 terms of a sequence can be written as Σi=18 Ai, where i is the index of summation starting at 1 and going to 8, while Ai represents the ith term in the sequence An.
It's important to note that without the specific form of the sequence provided, it's not possible to simplify the sigma notation further. However, if we had the formula for the nth term of the sequence, we could potentially express the sum in a more explicit format.