Question

Which sequence is modeled by the graph below?
coordinate plane showing the points (2, 1); (3, 2); (4, 4); and (5, 8)

A) a_n = one half(2)^n − 1

B) a_n = 2(2)^n − 1

C) a_n = 4(−2)^n − 1

D) a_n = 2(one half)^n − 1