help graphing 3 functions

Graph these functions.

$\displaystyle f(x)=3^{x}$

$\displaystyle f(x)=-3(3)^{x}$

$\displaystyle f(x)=20\left(\frac{1}{4}\right)^{x}$

I know graphs don't have to be perfect. But how would these look....if there was a table for each function with x values of -3, -2,-1, 0, 1, 2, 3 ?

The tables, respectively, would be:

__x/ f(x)__

-3/ (1/27)

-2/ (1/9)

-1/ (1/3)

0/ 1

1/ 3

2/ 9

3/ 27

__x/ f(x)__

-3/ (-1/9)

-2/ (-1/3)

-1/ -1

0/ -3

1/ -9

2/ -27

3/ -81

__x/ f(x)__

-3/ 1280

-2/ 320

-1/ 80

0/ 20

1/ 5

2/ (5/4)

3/ (5/16)