Answer:
s8 = -42
Step-by-step explanation:
Sn = n / 2 [ 2a1 + (n-1) d ]
s8 = 8 / 2 [ 2(-7) + (8-1) 1/2 ]
s8 = 8 / 2 [ -14 + (7) 1/2 ]
s8 = 8 / 2 (-14) + (7/2)
s8 = 8 / 2 (-21/2)
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Answer:
s8 = -42
Step-by-step explanation:
Sn = n / 2 [ 2a1 + (n-1) d ]
s8 = 8 / 2 [ 2(-7) + (8-1) 1/2 ]
s8 = 8 / 2 [ -14 + (7) 1/2 ]
s8 = 8 / 2 (-14) + (7/2)
s8 = 8 / 2 (-21/2)
s8 = -42