Which exponential function can be used to show the geometric sequence 40, 160, 640, . . . ?(1 point)
Responses
an=40(4)^n−1
a subscript n baseline equals 40 left parenthesis 4 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 plus 4 left parenthesis n minus 1 right parenthesis
an=4(40)^n−1