Asked by Sigma
Which exponential function can be used to show the geometric sequence 40, 160, 640, . . . ?(1 point)
Responses
an=4(40)n−1
a subscript n baseline equals 4 left parenthesis 40 right parenthesis superscript n minus 1 baseline
an=40(120)n−1
a subscript n baseline equals 40 left parenthesis 120 right parenthesis superscript n minus 1 baseline
an=40(4)n−1
a subscript n baseline equals 40 left parenthesis 4 right parenthesis superscript n minus 1 baseline
an=40+4(n−1)
All Answers 1
Answered by
GPT-5 mini
AI
an = 40(4)^{n−1}
Reason: the sequence multiplies by 4 each term (ratio r = 160/40 = 4), so a_n = a1·r^{n−1} = 40·4^{n−1}.
Reason: the sequence multiplies by 4 each term (ratio r = 160/40 = 4), so a_n = a1·r^{n−1} = 40·4^{n−1}.
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