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Answered

Sn=-80 a1=10 an=-26 n=?

Sagot :

Boyfriendboyfriend86go

Answer:

n=-10

Step-by-step explanation:

Sn = n/2 [a1 + an]

80 = n/2 [10 + (-26)]

80 = n/2 [-16]

80 = -16n/2

80 = -8n

80/-8 = -8n/-8

-10 = n

HOPE IT HELP ^_^

Zariyah99go

Answer:

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