leslielynnette06 leslielynnette06

12-01-2022
Mathematics

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PLEASE HELP!!!!!! 20 POINTS!!!!!

PLEASE HELP 20 POINTS class=

Respuesta :

12-01-2022

Answer:

-18.703

Step-by-step explanation:

a₁=-28(-1/2)¹⁻¹

r=-1/2

a₁=-28

r=-1/2

S₉=a₁[tex]\frac{1-r^{9} }{1-r}[/tex]

S₉=-28[tex]\frac{1-(\frac{1}{2})^{9} }{1-(\frac{1}{2}) }[/tex]

S₉=[tex]-\frac{1197}{64}[/tex]

S₉=-18[tex]\frac{45}{64}[/tex] S₉=-18.703125

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