Please help me with my algebra homework? What is the sum of the geometric sequence 1,-6,36,.... if there are 7 terms?(1 point)

asked Feb 22, 2022 160k views

2 votes

Please help me with my algebra homework?

What is the sum of the geometric sequence 1,-6,36,.... if there are 7 terms?(1 point)

4.4k points

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6 votes

Answer:

Explanation:

a=1

r=-6/1=-6

$S_(7)=a(1-r^n)/(1-r) =1(1-(-6)^7)/(1-(-6)) \\=(1+6^7)/(1+6) \\=(1+279936)/(7) \\=(279937)/(7) \\=39991$

Rico Chen answered Feb 27, 2022

4.1k points

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