Write the explicit formula for the geometric sequence.
a1 = -5 a2 = 20 a3 = -80
A. an = -5 • (-4)n
B. an = -5(-4)n-1
C. an = -4(-5)n-1
D. an = -5 • (4)n

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look
a1 = -5
n=1
a2=20
n=2, etc..

This way you can eliminate A because term 2 doesn't match up... And I think Jhanny's right

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