Which sequence is modeled by the graph below?
coordinate plane showing the points 2, 8; 3, 4; 4, 2; and 5,
a. an = one half (16)n − 1
b. an = 4(2)n − 1
c. an = 16(−2)n − 1
d. an = 16(one half)n − 1
(correct answer)