Question

Express the series below in summation notation for the specified number of terms.
7. 4 + 8 + 12 + 16 + 20

Answer 1

\[\sum_{n=4}^{5}_{?}(n+4)\]

Answer 2

would this be the equation

Answer 3

nope

Answer 4

try again

Answer 5

since u have 5 terms in the series,
u need to have the bounds range from 1 to 5, ok ?

Answer 6

\(\large \sum \limits_{n=1}^5XXX\)

Answer 7

next look at the series :
4 + 8 + 12 + 16 + 20

Answer 8

wat kindof series is it ?

Answer 9

whats the triple x for

Answer 10

arithmetic or geometric ?

Answer 11

you need to fill in XXX

Answer 12

arithmatic

Answer 13

good, whats the \(n^{th}\) term ?

Answer 14

n1

Answer 15

4 + 8 + 12 + 16 + 20

\(n^{th}\) term = \(4 + (n-1)*4 = 4 + 4n - 4 = 4n\)

Answer 16

plug that in ur sum notation

Answer 17

so the equation would be \[\sum_{n=1}^{5} 4(n-1)\]

Answer 18

4 + 8 + 12 + 16 + 20

can be represented in sum notation as :


\(\large \sum \limits_{n=1}^5 4n\)