Asked by Neil
                   20
(Sigma Sign) 2n + 7
k= 1
            
        (Sigma Sign) 2n + 7
k= 1
Answers
                    Answered by
            MathMate
            
    ∑2n+7
=2∑n + ∑ 7
=2*(20+1)(20/2) + 20*7
=420+140
=560
    
=2∑n + ∑ 7
=2*(20+1)(20/2) + 20*7
=420+140
=560
                    Answered by
            Neil
            
    Thank you, MathMate.
    
                    Answered by
            Neil
            
    Wait, do you know how it could be plugged into the Sn= a1 (1 - r^n/ 1 - r) formula?
    
                    Answered by
            MathMate
            
    Sn= a1 (1 - r^n/ 1 - r)
applies when the series is a geometric progression, such as
20
∑ a1*r^i
i=1
    
applies when the series is a geometric progression, such as
20
∑ a1*r^i
i=1
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