Which sequence is modeled by the graph below?

a. a^n = 2(n - 1)^1
b. a^n = 2(1)^n-1
c. a^n = 2 + (1)^n-1
d. a^n = (2) (n - 1)

For every touchdown scored by the timberwolves the mascot does three backflips if the cheerleaders set off six confetti cannons how many touchdowns did the timberwolves score if the cheerleader set of 18 confetti cannons