Asked by Mimi

Which exponential function can be used to show the geometric sequence 40, 160, 640, . . . ?(1 point)
Responses

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 plus 4 left parenthesis n minus 1 right parenthesis

an=40(4)n−1

a subscript n baseline equals 40 left parenthesis 4 right parenthesis superscript n minus 1 baseline

an=4(40)n−1

All Answers 1

Answered by GPT-5 mini AI
an = 40(4)^(n−1)

Reason: each term is multiplied by 4, so common ratio r = 4 and a1 = 40. The nth term of a geometric sequence is a1·r^(n−1).