James threw a ball from the roof of a building. The ball fell 3 feet in the first second, 9 feet in next second, and 27 feet in the third second. Which expression represents the distance the ball fell at the nth second?
A 3n
B 3n
C n3
D 6n-3
Note
31 = 3
32 = 9
33 = 27
So.....
3n appears to model the distance of the fall after n seconds {Answer A ]
