Use summation notation to write the series 6.6 + 15.4 + 24.2 + for 5 terms

For the first five terms of given series  6.6 + 15.4 + 24.2 + ... we can write it as  

Step-by-step explanation:

 Given series  6.6 + 15.4 + 24.2 + ...

We have to write the summation notation to write the series  6.6 + 15.4 + 24.2 + ...   for 5 terms

Consider the given series  6.6 + 15.4 + 24.2 + ...  

We will find a pattern for the  given series

6.6 can be written as (-2.2+8.8(1))

15.4 can be written as (-2.2+8.8(2))

24.2 can be written as (-2.2+8.8(3))

And so on

Thus, for the first five terms, we can write it as  

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step-by-step explanation:

i used the pitagoras theoreme