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How do I use summation notation to write the series 2.2 + 6.6 + 11?

1 Answer

Sep 15, 2015

$2 \sum n = 0 (2.2 + 4.4 n)$ $sum_(n=0)^(2) (2.2+4.4n)$

Explanation:

Perhaps the biggest problem here is to recognize the arithmetic progression of the given values:

$2.2$ $2.2$

$6.6 = 2.2 + 4.4$ $6.6 = 2.2 + 4.4$

$11 = 6.6 + 4.4$ $11 = 6.6 +4.4$
$X = 2.2 + 4.4 + 4.4$ $color(white)("X") = 2.2+4.4+4.4$

So starting with a base value of $2.2$ $2.2$ each step increases by $4.4$ $4.4$

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