# How do you find the sum given Sigma c from k=1 to 4?

${\sum}_{k = 1}^{4} c = 4 c$
I assume that $c$ is a constant, then
${\sum}_{k = 1}^{4} c = c + c + c + c$
$\therefore {\sum}_{k = 1}^{4} c = 4 c$