Write the sum using summation notation, assuming the suggested pattern continues.

-4 + 5 + 14 + 23 + ... + 131

Help???;(

Question

Write the sum using summation notation, assuming the suggested pattern continues.

-4 + 5 + 14 + 23 + ... + 131

Help???;(

amistre64 · Answer

by any chance is there a common difference you can espy?

amistre64 · Answer

if we add 4 to it all we might be able to see it better

amistre64 · Answer

{-4 + 5 + 14 + 23 + ... + 131} + 4

{0 + 9 + 18 + 27 + ... + 135}

anonymous · Answer

$$\sum_{n=0}^{oo}(-4+9)$$

anonymous · Answer

is that correct? @amistre64

amistre64 · Answer

9n  and the summation is not to infinity .... but your on the right track

amistre64 · Answer

-4+9n = 131,  solve for n

anonymous · Answer

9n*

anonymous · Answer

i got 15

anonymous · Answer

so instead of infinity it would be 15 right!?

amistre64 · Answer

good,  then 15 up top instead of infinity

anonymous · Answer

awesome sauce! you're beginning to become my new best friend haha this subject is killing me..

anonymous · Answer

@amistre64

amistre64 · Answer

it just takes some practice is all :)