Inactive Tutor answered • 06/05/15
Tutor
New to Wyzant
S5 = (n/2)(2a1 + (n - 1)d)
S5 = (5/2)(2(-8) + 4(3))
S5 = (5/2)(-16 + 12)
S5 = (5/2)(-4)
S5 = 5(-2)
S5 = -10
Rob D.
asked • 06/05/15Partial Sum
S5 of the sequence an = -8+(n-1)3
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