Question

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

Answer 1

`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`

`6.6 = 2.2 + 4.4`

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

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