Question

more mathh workk last questionn .

Write in summation notation: 3 + 6 + 9 + 12 + ... + 30
a) C
b) A
c) B

Answer 1

Alright, working on it

Answer 2

Let me work it out rq and I'll get it to you (:

Answer 3

so summation notation, often represented with the sigma symbol Σ , is a way of expressing the sum of a series of terms. The series we have is an arithmetic sequence where each term increases by a certain number, which in our case is 3
To write your series in summation notation, we'll need to identify:
1. The first term... which is 3

Answer 4

So that's what we'll call a1
The next thing we need to identify is the numerical difference between each number... which is d=3

Answer 5

Because if you look at your question the numbers are going up by 3

Answer 6

Now it's said that there are "n" terms in the sequence and the last thing we need to know and fill in is the general sequence formula

Answer 7

this makes my brain hurt .

Answer 8

but so that means it's A ? .

Answer 9

Now we have to figure out what n equals
Since the last term is 30 and we start at 3 and increase by 3 each time, we can find n by solving the equation for 30 so: 30=3+(n-1)x 3
once a1 and d are plugged in and now we solve 30= 3+3n -3

Answer 10

30= 3+3n -3 becomes 30=3n
So n= 1

Answer 11

Wait wait I did that wrong

Answer 12

Your answer is B

Answer 13

YAYYAYAYYYY TYYTYTYSM FOR ALLL THE HELPP .