<u> ∑ k = 1 88 2.5  ( 1.2 ) k</u><u>  is this series written in </u><u>sigma notation. </u>
What is the series written in sigma notation?
- A series can be represented in a compact form, called summation or sigma notation. 
- The Greek capital letter, ∑ , is used to represent the sum. The series 4+8+12+16+20+24 can be expressed as 6∑n=14n . 
- The expression is read as the sum of 4n as n goes from 1 to 6 .
Given:
2.5 + 2.5(1.2) + 2.5(1.2)2 + ⋯ + 2.5(1.2)87
If we look at the power it is always one less the term i.e., for first term the value of k=0.
So, the series in the form of summation can be written as
 ∑ k = 1 88 2.5  ( 1.2 ) k 
Learn more about sigma notation
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Answer: they had a bad reputation
Step-by-step explanation:
 
        
                    
             
        
        
        
1) C-5
2)14-5
3)9=The value!
I hope this helps!