Which sequence is modeled by the graph below?

coordinate plane showing the points 2, 1; 3, 3; and 4, 9

an = 1/3(27)^n − 1
an = 27(1/3)^n − 1
an = 1/3(3)^n − 1
an = 3(1/2)^n − 1

Question

Which sequence is modeled by the graph below?

coordinate plane showing the points 2, 1; 3, 3; and 4, 9

 an = 1/3(27)^n − 1
 an = 27(1/3)^n − 1
 an = 1/3(3)^n − 1
 an = 3(1/2)^n − 1

mathmale · Answer

Kindly enclose the coordinates of each point inside parentheses.
Is this sequence increasing or decreasing?  Answering this correctly should help you to eliminate two of the possible answer choices.

anonymous · Answer

the first point is (2,1) second is (3,3) and the last is (4,9) and it
 is increasing