tell whether each equation represents growth that is linear, exponential, or neither.
1)
[tex]y = ( {3}^{2} )x[/tex]
2)
[tex]y = 3( {2}^{x} )[/tex]
3)
[tex]y = 3 {x}^{2} [/tex]
4)
[tex]y = 2( {3}^{x)} [/tex]