Question

Is Any good with sigma notation and can help with a few questions ?

Answer 1

\[\sum_{n=4}^{7}-2n+3\]

Answer 2

It means you need to add up -2n+3, starting from n=4 and stopping at n=7
\[\Large \sum_{n=4}^{7}-2n+3 =\]
\[\large = (-2*4+3) + (-2*5+3) +(-2*6+3)+ (-2*7+3)\]

Answer 3

ok so
-5
-7
-9
-11
is it -32 ?

Answer 4

Looks that way.

Answer 5

thanks so much . (:

Answer 6

what is partial sum ?