Which is the graph of f(x) = 2(3)x?

The last graph.

Hope this helps.

I'm assuming the equation should be

If so, then plug in x = 1 to find that

Showing the point (x,y) = (1,6) is on the curve. Only choice A reflects this. So choice A is the answer.

Choices B,C, and D can be ruled out. For instance, with choice B, plugging in x = 2 leads us to get

Indicating that (2,18) is on the curve instead of (2,12). This shows choice B is not a a valid answer. Similar situations will happen with C and D.