These tiles represent the expression 5+5x+4x.

To simplify the expression \(5 + 5x + 4x\), you can combine the like terms involving \(x\).

The expression can be rewritten as: \[ 5 + (5x + 4x) \]

Now, combine the terms: \[ 5 + 9x \]

Thus, the expression equivalent to \(5 + 5x + 4x\) is: \[ 5 + 9x \]