Use sigma notation to represent the following series for the first 10 terms. 3 + (-6) + 12 + (-24) + ⋯

Step-by-step explanation:

First, as you can see, the sequence is alternating its sign everytime, so you can deduce this term:

The sequence start from 3, and the following terms are the product between 3 and . Take a look:

For n=1

For n=2

And so on...

Let's verify the formula including all terms:

Since the sequence start from 3, we must change the 3 for -3. Because is always negative for the first term:

For n=1

For n=2

For n=3

For n=4

So, one possible sequence is:

And the serie would be given by:

it is c, trust i got your back lol

step-by-step explanation:

21

jk it's 20

step-by-step explanation: