first question. solve for x: Σ


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Question Number 57549 by Joseph2002 last updated on 07/Apr/19

$f i r s t q u e s t i o n .$ $s o l v e f o r x : \underset{k = 1}{\sum^{5}} k x = 60$
Commented by math1967 last updated on 07/Apr/19

$x + 2 x + 3 x + 4 x + 5 x = 60$ $\Rightarrow 15 x = 60 ∴ x = 4$
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