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borishaifa [10]
2 years ago
7

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

Mathematics
1 answer:
Advocard [28]2 years ago
5 0

Answer:

-18.703

Step-by-step explanation:

a₁=-28(-1/2)¹⁻¹

r=-1/2

a₁=-28

r=-1/2

S₉=a₁\frac{1-r^{9} }{1-r}

S₉=-28\frac{1-(\frac{1}{2})^{9}  }{1-(\frac{1}{2}) }

S₉=-\frac{1197}{64}

S₉=-18\frac{45}{64}   S₉=-18.703125

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