Respuesta :

padmalathal

Answer:

-8

Step-by-step explanation:

b(n)=1(-2)^n-1

substitute 4 with n

b(4)=the 4th term

b(4)=1(-2)^4-1

b(4)=1(-2)^3

b(4)=1(-8)

b(4)=-8

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